Analytical balance range

The operating range minimum and maximum means: The minimum value is the lowest value at which the balance will give an accurate reading as per repeatability test. The maximum value is the maximum capacity of the balance. USP General Chapter 41 (Balances) sets three distinct requirements to be applied to materials that must be accurately weighed If a standard deviation less than 0.41 digit is obtained (in other words, 0.041 mg for an analytical balance with a readability of 0.1 mg), this must be replaced by 0.41 d so that the smallest possible starting point of an operating range of up to 820 d (2 * 0.41 * 1,000) is obtained If any balance has the operating range from 0.01 mg to 110 gm then it should be used for weighing the material from 0.01X50 = 0.50 mg to 110X80% = 88.00 gm. Detailed guidance on the balances can be learned through OIMLR76-1 Non-automatic Weighing Instruments The manufacturer generally recommends a method for determining the acceptable range for your balance by making replicate weighings.(see Appendix for example)Reasonable tolerance guidelines +0.5 milligrams for weights equal to or below 100 mg + 1 mg for weights ranging from 100 mg to 1 gm +2 mg from weights greater than 1 g

Analytical balances are highly sensitive lab instruments designed to accurately measure mass. Their readability has a range between 0.1mg - 0.01mg. Analytical balances have a draft shield or weighing chamber to prevent the very small samples from being affected by air currents Suggested QC for Analytical Balances • Calibrate balance daily if it is equipped with an on-board internal calibration feature • Verify balance accuracy monthly with at least 2 external ASTM class 1 (S) weights (1 in mg range; 1 in the g range) • Record weight measurements, maintenance and corrective action in a logboo Weighing range of analytical balance can be measured by using two parameters. Calculation to determine the actual starting point of the balance's operating range (ORmin). If the SD < 0.41d, it must be replaced by 0.41d, where d is the readability of the balance You will need to assure that you have appropriate test weights, and that they are calibrated by a competent vendor. Now, analytical balances typically have a sweet spot, around 50% of range. Hopefully this is the use range of the balance, and what you are interested in. So you definitely want to verify it there

Analytische balans - Diverse modelle

An analytical balance (or lab balance) is a class of balance designed to measure small mass in the sub-milligram range. The measuring pan of an analytical balance (0.1 mg resolution or better) is inside a transparent enclosure with doors so that dust does not collect and so any air currents in the room do not affect the balance's operation If an analytical balance that has a readability of 0.0001g (gram), and has a needed measurement range of 100g (grams) down to 100mg (milligrams), with a critical measurement point at 1g (gram), then the NIST Traceable calibration weights needed for this internal check would be at a minimum 100g, 1g, and 100mg An analytical balance is a highly sensitive lab instrument that is designed to accurately measure mass. They have a readability range between 0.1mg - 0.01mg. They are meant to detect very fine increments of the materials being weighed. Even the slightest breeze or vibration can affect the readings

Our analytical balances offer a wide range of readability. Analytical Balance Product Manufacturers. Here at Certified Scale, we have balances available from several of the weighing industry's biggest global leaders, including, Sartorius, A & D, and Ohaus. Shop with Certified Scale today for sale prices on name brand balances What is an analytical balance? An analytical or semi analytical balance is a form of scale that measures mass to a high degree of precision. It has a weighing capacity in the range of 54-520 g and a readability of 0.005 mg - 0.1 mg. Analytical balance sensitivity requires it to be protected by a draft shield or an enclosure Let's look at an example to find out. If the maximum uncertainty tolerance is 0.1%, and the balance's R std is 0.1mg, then the minimum weight would equal 2*0.1mg / 0.001 or 200mg. Thusly, a 0.1mg balance would be insufficient to meet the stated accuracy requirements for this example, and a balance with a readability of 0.01mg must be used To sum it up, dual-range is a feature that allows scales and balances to automatically refine their resolution to provide finer readability when weighing small samples. This is particularly useful in analytical balances. We hope this was helpful in understanding what 'dual-range means. Don't hesitate to contact us if you have questions, and.

To meet the check criteria for this stage, the measurement of uncertainty should not exceed .001.The maximum loading range of each balance is supplied by the manufacturer, and these checks should be conducted so they cover the entire loading range, from lower to higher limits. How Frequently Should External Calibration Be Conducted Delta Range Digital Delta Range Analytical Balance Mettler Digital Lab Scale Balance Analytical Balance 210G Sartorius Model 0 1Mg Laboratory Analytical Balance Ohaus. For an analytical balance it is typically 0.1 milligram or 0.001 g. Micro and ultra microbalances can weigh lighter samples. Accuracy is sometimes confused with precision but it is an incorrect assumption. Precise means that results are consistent

Analytical Balance Working Range Veeprh

XPR Micro-Analytical Balances with readability range between 0.001 mg and 0.01 mg, and capacities up to 52 g, offer extremely high accuracy and low minimum weight, what enables you to weigh very small quantities, leading to considerable material and cost savings. Check how our balances can improve your workflow Analytical Balance: We offer the exclusive range of Analytical Balance to our clients. Our products are robust in construction and optimum in performance, our offered range of machine is manufactured using bes Laboratory balances Laboratory balances - top-class weighing instruments designed to enable performance of the most advanced measuring processes in the laboratory. They are used in chemical, pharmaceutical, cosmetics, food and jewellery industries, and wherever there is a need for precise mass measurement an analytical balance that includes the key features that you need but doesn't exceed your budget, this is an easier task than it sounds, as there is a good range of balances available and we have chosen the analytical balances that provide the best value for money for sale on our scalesandbalances web shop. Capacit

balance analytical 200g x 0.1mg. 830/6 jk-200 ymc balance electronic analytical 200g/0.0001g 220v. 830/7 ib-30 ymc balance electronic moisture 30gm/1mg 220v/60hz. 831 ga200 ohaus balance analytical 200g x 0.1mg. 831/2 ct200-s3 ohaus balance electronic portable 200g x 0.01g 220v. 831/3 ls200-00 ohaus balance portable 200g x 0.1g 9v. 863/5 jb-300. The USS-DBS8 Digital Analytical Balance Scale allows the user to measure weights that range up to 200g, with the precision of 0.1mg. It is fully electronic and it allows the user to read the measure from the LCD screen that has a convenient black backlight Digital/ Electronic Analytical Balance is a class of balance designed to measure small mass in the sub-milligram range. The measuring pan of an analytical balance (0.1 mg or better) is inside a transparent enclosure with doors so that dust does not collect and so any air currents in the room do not affect the balance's operation Analytische balansen met intuïtieve bediening en geïntegreerde toepassingen om uw weeg-. processen snel en gemakkelijk te maken! Robuust & gebruiksvriendelijk. Bekijk het aanbod Weighing range 200g. Analytical balances with weighing range max 200g. There are 23 products. Sort by: Best sellers Relevance Name, A to Z Name, Z to A Price, low to high Price, high to low. Showing 1-23 of 23 item (s) Active filters

USP Chapter 41 Balances Determining of the Operating Range

  1. Analytical Balances and Proper Weighing Practices. Five precautions to take for correct weighing of laboratory samples. May 22, 2019 Kevin Hill. If you want accurate weight measurements of laboratory samples, you need to have the right kind of scales. For example, you can use an analytical balance to correctly weigh the lab samples
  2. 1.2 Introducing the XS analytical balances The XS family of anlytical balances comprises a range of analytical balances which differ from each other in relation to their weighing range and resolution. The following features are common to all models of the XS lines
  3. d that proximity of air condi-tioners, open doors, and computer/laptop ventilation fans are sources of turbulence. - Do not set up the balance in close prox-imity to heat radiators, lamps or lighting fixtures. - Rapid changes in temperature influence results of measurement. Anti-vibration Balance Tabl
  4. balances. MRCs provide a wide range of Laboratory balances same as: analytical balance, medical balance , moisture balance, precision balance. A balance is an integral component of lab work, and choosing the correct equipment is essential to obtaining efficient performance and accurate results. For understanding the difference between serieces. A
  5. The Excellence XSE analytical balances are available in single- and dual-range models. Choose the single range if your weighing needs are in the middle to upper end of the maximum capacity. The dual range models are best suited for applications in the lower to middle end of the maximum capacity, because the fine range has increased accuracy in.

Analytical balances are a category of scientific scales or laboratory balance used for exacting weighing applications of small amounts of material in the laboratory, in educational environments or in the wider industrial workplace, in fact anywhere requiring fast and accurate weighing performance. A wide range of models are available with defined weighing ranges, readabilities, accuracies and. The Mettler Toledo AT261 Analytical Balance is a dual range balance with weighing capacities of 62 grams and 205 grams. In the 60g range, expect readability of 0.01mg, repeatability of 0.015mg, and linearity of ±0.08mg. In the 200g range, expect readability of 0.1mg, repeatability of 0.05mg, and linearity of ±0.15mg For sale from http://www.HiTechTrader.com - Mettler Toledo Delta Range Semi-Micro Balance, Model AT261, with auto calibration, dual ranges 62g x (0.01mg).

Calculation for Weighing Range of Balances

Industries That Use Analytical Balances. The precise measurements offered by an analytical scale makes it a critical piece of equipment for any sector that relies on quantitative chemical analysis. They are available in various shapes and sizes and can display readouts in various units, making them suitable for a wide range of industry. Weighing capacities of an analytical balance range from tens or hundreds of grams to as low as 0.1 or 0.01 mg. Practical features include a clock, mass unit conversion, piece counting, and data record-keeping. Semimicrobalances and microbalances. Semimicrobalances can weigh to onehundredth of a milligram. They are generally used for extremely. It offers analytical balances that have a range of readability from 0.005 mg-0.1 mg. The balances from Mettler Toledo also have different capacities to help you conduct quantitative chemical analysis with ease. Mettler Toledo gives you the chance to choose from the diverse forms of analytical balances depending on your specific needs

general-purpose balances into five classes based on accuracy (See Table 2). 3.2 Analytical Balances: 3.2.1 Analytical balances should conform to the accuracy, sensitivity, and readability requirements of a class specified in Table 1. 3.2.2 Place a label on each balance stating the class of the balance in a location easily seen by the user. Texa Analytical Balance, Lab Balance, Weighing Scale manufacturer / supplier in China, offering Analytical Balance Weighing Range 0-200g Readability 0.0001g, UV1800 Single Beam 190-1100nm UV/Vis Spectrophotometer with 2nm Bandwidth and 320*240 LCD Display, K8000 High Quality Double Beam UV/Visible Spectrophotometer and so on Delta Range Analytical Balance With the Excellence Plus XP, METTLER TOLEDO has set another milestone in the world of analytical balances. Cutting-edge innovations bring unprecedented weighing performance and set new standards in terms of personnel, sample and data security

Balances have greater precision then standard scales. While some are appropriate for harsh environments, most were designed for laboratory use. Data Weighing Systems offers a wide range of high precision balances from world class manufacturers such as Sartorius and A&D Minimum weight. 21 to 120 mg. Capacity. 31 to 520 g. Readability. 0.01 to 1 mg. Analytical Balance. We hold expertise in offering optimum quality Analytical Balance to our valuable customers. These weighing machines are commonly used to determine the weight of small mass in milligram range 10 Overview XS Analytical Balance 4 Setting up the Balance This chapter explains how to unpack your new balance, and how to set it up and prepare it for operation. When you have carried out the steps described in this chapter, your balance is ready for operation. 4.1 Unpacking and Checking the Delivered Items 4.1.1 Unpacking the Balance

We've worked with Mettler analytical balances for decades - from the classic AE163 models up to the recent AX and XP series units. We have some XSE models in stock and available and thus far we are impressed with the capabilities of these units. The Mettler XSE 105 dual range balance is in many ways similar to the Mettler XP105 UniBloc Analytical Balances. AUW-D series dual-range semi-micro balances. Excellent Weighing Performance. Compact UniBloc mechanism and digital processing technology produce fast response and stability at the same time. For Applications. Shimadzu's unique Balance Keys a standard feature General description. Model AP250D offers delta ranging with 0.01mg resolution up to 52 g, and 0.1mg up to the full scales of 210g. The Analytical Plus series weigh in 8 different units, count pieces and have built-in GLP features. RS232 interface. Lock switch Analytical Balances . 0.1 mg : Precision Balances . 100 - 1 mg : Technical Balances . range between 50% of maximum capacity and the maximum capacity of the balance or the maximum operational range defined by the laboratory. A minimum of 5 replicates should be carried out for each weight.. Radwag Balances And Scales is a leading manufacturer of a wide range of modern analytical balance, moisture analyzer, electronic scales and accessories for many industries in Poland and in the world

Analytical balances GH252 delta range semi micro balance weighs up to 101 gram with 0.01 milligram graduations and from 101 - 250 grams the balance increments in 0.1mg divisions. Built in motorized calibration weight AUW-D dual-range semi-micro balances are the world first five-decimal balances with the advantages of UniBloc one-piece force cell technology. Dual Range Balance for sale and auction. New and used Analytical balances always available at LabX

What are Analytical Balances? - Adam Equipment US

Labratory Scales & Analytical Balances. Our selection includes both electronic and mechanical balances, designed for anywhere where tight precision is a must. Majority of Universities, research centers, laboratories, pharmacies even hospitals use these scales for research and development purposes, to weigh medical / pharmaceutical supplies and. Mettler Toledo AB135-S/FACT Dual Range Analytical Balance. $399.99. + shipping. + shipping + shipping. Mettler Toledo XS204 Analytical Digital Lab Balance. $1,005.91. $1,341.22 previous price $1,341.22 previous price $1,341.22. Free shipping Free shipping Free shipping. Picture Information

SOP for Calculation of Weighing Range of Analytical Balanc

  1. An analytical balance is a highly sensitive laboratory instrument which accurately measure mass in the sub-milligram range to a high degree of precision . Analytical Balances have a weighing capacity in the range of 100-500 g and a readability of 0.1 mg - 0.001 mg
  2. DENVER INSTRUMENTS AA-250 DIGITAL ANALYTICAL BALANCE SCALE What we have is a Denver Instruments AA-250 Digital Analytical Balance Scale. Weighing Range- 250g, Readability- 0.1mg, Reproducibility (standard deviation) 0.1mg, Linearity- +/0.2mg, Scale has been tested to power on and is in excellent working condition
  3. The Kern ABT 120-5DNM has a readout of 0.01 mg in the range of 0-42 g; when samples larger than 42 g are weighed the balance automatically switches to a readout of 0.1 mg. The capacity of the balance is 120 g. The ABT semi-micro balance is a high end solution for all your most demanding laboratory procedures
  4. al, system and applications As soon as you have these Operating Instructions - Part 2 for Excellence XS balances in your hand, you are ready to use your balance. Your balance has been assembled and leveled
  5. Analytical Balances Pioneers in the industry, we offer digital analytical balance 200gm x1mg, digital analytical balance 200 gm x 0.1 mg internal calibration, portable analytical balance 200gm x0.001 gm, analytical balances 500gm x 1mg, digital analytical balance 500 gm x 1 mg and analytical balance - sab 265dr 60g/200g from India

Operating Range & Calibration for Analytical Balanc

Worksheets for Analytical Calibration Curves Excel and OpenOffice Calc Versions (September 26, 2017) [] [Instructions] [Frequently Asked QuestionsThese are fill-in-the-blanks spreadsheet templates for performing the calibration curve fitting and concentration calculations for analytical methods using the calibration curve method Page 120: Zero-Setting Range And Switch-On Zero Range For Certified Balances Technical data and accessories 16.2.1 Zero-setting range and switch-on zero range for certified balances Zero-setting range Certified balances can only be set to zero within ± 2% of the maximum capacity. Outside this range, the balance must be tared Wolflabs is currently the public sectors top supplier for this range of products through framework agreement LAB5028 LU. The products we are featuring are from A & D Instruments, Adam Equipment, Kern & Sohn GMBH, Mettler Toledo, Ohaus and Sartorius with maximum capacities from 60 to 510g, readabilities of 0.00001 to 0.001mg, pan diameters from 80 to 91mm, pan width and depth of 85mm, models.

Analytical Balances - Amazon

Analytical balances for weighing up to 520 g maximum with 0.1 or 0.01 mg resolution. Cubis ® provides max. weighing performance, security and full network capability. Equipped with a touch screen, it is also suitable for customised workflows (Q-Apps) Mettler Toledo Model XS105 DualRange Analytical Balance sets new standards in weighing performance and more accurate and stabilization times dramatically shorter.. Mettler Toledo Model XS105 DualRange Analytical Balance, 41g/120g Capacity, 0.01mg/0.1mg Readability The Excellence XS Analytical Balance Line with its innovative accessories sets new standards for fast and efficient weighing processes

The Kern ABT 220-5DNM has a readout of 0.01 mg in the range of 0-82 g; when samples larger than 82 g are weighed the balance automatically switches to a readout of 0.1 mg. The capacity of the balance is 220 g. The ABT semi-micro balance is a high end solution for all your most demanding laboratory procedures The Mettler Toledo AE240 Digital Dual Range Analytical Balance (AE 240S) is intended for precise weight measurements of small quantities. Specifications: Dimensions. 8.07 W x 16.14 D x 11.42 H (20.5 x 41 x 29 cm) Weight. 22.7 lb (10.3 kg. Buy 0.1mg Labon Analytical Balance at an affordable price. get price, quote for lab equipment. Information, Specifications & Reviews for 0.1mg Labon Analytical Balance Of Weighing ScaleTable Top ScaleWe are the prominent company that is engaged in providing high quality range of 0.1mg Labo. Our website uses cookies. They help us understand. Shimadzu ATX224 Analytical Balance 220g Capacity, 0.1mg Readability - The ATX224 can hold up to 220 g and has a 91 mm pan size Therefore, a weighing range must be defined for all balances. Related: Calibration of Analytical Balance Weighing Range for Balances: Some manufacturers direct in their operating manual to weigh minimum 1.0 mg on balance having 0.01 mg least count i.e. least count X 100

Mettler Toledo XS205DU Analytical Balance. Be the first to write a review. About this product. Current slide 1 of 1- Top picked items. Used - Like New. $3,499.99*. Make an offer Analytical balance KERN ALS-A · ALJ-A · ALJ-AM Range of analytical balances, with large weighing ranges, also with EC type approval [M] Features · 1 KERN ALJ-A/-AM: Automatic internal adjustment in the case of a change in temperature 1,2 °C or timecontrolled every 3 h, guarantees high degree of accuracy and makes the balance independent of it What Is An Analytical Balance? Analytical balances are highly sensitive laboratory instruments designed to accurately measure mass. Their readability has a range between 0.1mg-0.01mg. The analytical balance has a ventilated shield or weighing chamber to prevent very small samples from being affected by air currents

PRODUCT FEATURES Electromagnetic force compensation technology Aluminum alloy die cast base and mains Stainless steel pan Easy to read LCD display with backlight Glass windshield with sliding doors Height adjustable feet RS232 and USB outputs Full capacity taring Below balance weighing facility Overload protection Selectable measure units: g, mg, ct, oz Piece counting and percentage functions. The USS-DBS16 Digital Analytical Balance Scale allows the user to measure weights that range up to 300g, with the precision of 0.1mg. It is fully electronic and it allows the user to read the measure from the LCD screen that has a convenient blue backlight. You can also switch between units; so if the metric system is not right for you, you can choose ounces or carats as measuring units IET - Used Lab Equipment - Refurbished Analytical Laboratory Instruments Page 1 of 9 www.IetLtd.com Proudly serving laboratories worldwide since 1979 CALL +847.913.0777 for Refurbished & Certified Lab Equipment Mettler Analytical Balance AE240 Dual Range Balance SPECIFICATIONS AE 240 Dual Range Balance Mettler Toledo AX26 Delta Range Microbalance used throughout the globe by researchers. Instrument available for purchase at The Lab World Group. www.thelabw..

This feature is very convenient to have in a micro, semi-micro, analytical or precision balance. Depending on the balance readability, usually for 4-, 5-, 6- and 7-digit balances it is launched every four hours, for lower resolution balances it is every six hours. However, time to time, external calibration is recommended as well The phenomenon of drift can occur adversely affecting analytical balances when weighing compounds. It refers to unstable weight readings, which typically occur due to static charge and inconsistent temperatures. Drift can cause changes in the measurements and leads to imbalances in displays. If enough static electricity is present in the. ANSI/ASTM Class 1 can be used as reference standard in calibrating other weights and appropriate for calibrating high-precision analytical balances (from 0.01mg to 0.1mg). ANSI/ASTM Class 2 Appropriate for calibrating high-precision toploading balances with readabilities ranging from 0.001g to 0.01g An analytical balance is a class of a balance that has a readability of 0.1 mg or better. At this level of readability, it is required for the balance to have a draft shield. Samples are placed inside of the draft shield onto the weighing pan. The purpose of the draft shield is to prevent drafts from influencing the weighing results

Types of Balances and Scales, Common Terms & Care

The Sartorious 1712 MP8 Dual Range SemiMicro Electronic Analytical Balance has easy to use menu operated calibrations: motorized internal calibration by a built in standard weights, for each range and external calibration by 30g weight, for the range 0-30g and by 100g weight for the range, 0-160g. The balance operating menu allows to adapt the balance to weighing environment, set up stability. Electronic analytical balances can be purchased with different weighing ranges and readabilities. A standard analytical balance typically has a maximum capacity of 160-300g and a readability of 0.1mg. Semimicro balances (readability 0.01mg, capacity up to 200g), microbalances (readability 1 μg, capacity up to 30g) and ultramicro balances (readability 0.1 μg, capacity up to 2g) are. On the latest analytical balances, an out-of-level balance warning message is given (along with an audible beep). A graphical level bubble representing the spirit level appears on the screen, turning from red to yellow at the legal limit of leveling, and finally to green when the balance is optimally level and ready to weigh This SOP shall provide the Operating procedure of analytical balance of quality control department. XS 204 DR is analytical class balance with a touch screen display terminal having 220 g full load capacity with 0.1 mg minimum display value in fine range up to 81 g / 1 mg minimum display value in full capacity range identification of trends. The laboratory can then address analytical problems and help improve the analytical process. Section 18.3.2 and Attachment 18A at the end of this chapter provide examples of several types of charts. The use of . statistical techniques is the preferred method for Contents . implementing quality control in the laboratory.

Calibration Criteria for Analytical Balanc

THe Mettler Toledo AE 260 Analytical Balance offers a weighing range of 60g or 205g with a reproducibility of 0.1mg and 0.5mg respectively The Mettler Toledo Excellence XS205 Balance offers precise, self-calibrating weighing in a compact easy to place unit. This analytical balance has a quick settle time of 1.5 seconds and features an intuitive touch screen display meant to guide users easily through applications and setting parameters Analytical Balances— Select a check-weight of an appropriate mass to examine an analytical balance. If possible, set the balance to read to 5 decimal places. Follow the manufacturer's operating instructions. Pick up the check-weight with a forceps, place it carefully on the balance pan, and weigh it nice blog.thanks for sharing this information.Analytical balance for weighing up to 220g provides you maximum weighing performance, security and full network capability with a touch screen. Atcomaart.com provides you wide range of analytical balance weigh scales with reasonable price. Analytical Balances manufacturers||Analytical Balances supplier Balances Our range of products include analytical balances, laboratory balances, wensar analytical balances, table top balance, general purpose electronic balance and shimadzu precision weighing balances

Scientech ZSA-Series Analytical BalancesMettler Toledo AT201 Analytical BalanceMettler Toledo AB204-S Analytical BalanceAnalytical balance - WikipediaBalance Enclosure: For Measurement of Hazardous Materials

Mettler Toledo AG245 Analytical Balance. The Mettler Toledo AG245 Analytical Balance is a compact, easy-to-use analytical balance with fully integrated draft shield doors and convenience for right- and left-handers. The AG 245 offers dual range weighing capacities of 210 grams and 41 grams with 0.1 mg and 0.01 mg readability respectively Analytical Balances Micro Analytical BM Series (Capacity : 5.2 g to 520 g / Readability : 0.001 mg to 0.1 mg) A built-in fanless ionizer that allows for instant removal of destabilizing static electricity from the sample and container Includes four 0.001 mg readability models to be selected for different purpose Analytical weighing balances. Analytical Weighing balances are most critical part of pharmaceutical industry as it directly impact the final product quality. Q1. What is the principle of analytical weighing balance ? Analytical weighing balances are based on the principle of load cell Analytical Balance Scales. Analytical balances offer a range of weighing capacities (tens to hundreds of grams), with a readability down to 0.1 or 0.01 mg. You can choose between internal motor-driven calibration, or external calibration for your analytical balance, with some models offering both KERN ALJ-A03: Ioniser to neutralise electrostatic charge for fixed installation in the analytical balance. This it makes for convenient handling as you no longer need a separate device. Simply enable the ioniser fan at the push of a button. Suitable for all models in this range. see accessories. Adjusting program CAL for quick setting of the. USP Minimum Weight. USP (United States Pharmacopeia) section 41 states the requirements for balances used for materials that must be accurately weighed. Unless otherwise specified, when substances must be accurately weighed, the weighing should be performed using a balance that is calibrated over the operating range and meets the.