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Individual Weight By Class
Calibration Weights and Calibration Mass Sets
Calibration Weights are used to check the reading of scale, to make sure it is still accurate. They used when calibrating a scale. While the calibration states how a scale behaves, adjustment of the scale changes its behavior. What it dose is a set of operations carried out on a scale so that it provides prescribed indications corresponding to given values of a quantity to be measured. Therefore, adjusting a scale means modifying its indications in a way that allows them to correspond – as much as possible – to the quantity values of the measurement standards applied. Calibration Weights

If you need to do a scale calibration you came to the right place. First you need to check your scale manual and check what calibration masses you need. You may need individual weights or calibration weight sets. Remember that many analytical balances and lab balances need precision weights to meet precision calibration weights - calibration standards. If you need help on finding what type of test weights you need please call us at 800-832-0055.

Find Weight By Class

Beginning January 1, 2020, Rice Lake Class F calibration weights will no longer be sold for legal metrology use. According to the newly updated NIST Handbook 105-1 (2019), new weights for use as field standards placed into service for weights and measures use after this date must comply with all of the requirements of NIST Handbook 105-1 (2019). In order to update our Class F inventory to bring it more in line with ASTM and OIML tolerances, all Rice Lake NIST Class F weights will become ASTM Class 5 weights. Part numbers and pricing will remain the same, but the tolerance will be tighter.

Note that existing NIST Class F calibration weights in the field are grandfathered in and may continue to be used for legal metrology use, but they must meet NIST Handbook 105-1 (1990) requirements. Although the new revision does supersede the 1990 version, it makes clear that existing Class F weights may continue to be used.

While existing NIST Class F calibration weights may be reclassified to one of the new specifications if all specifications and tolerances fully comply with the alternative standard, the NIST Office of Weights and Measures strongly recommends that you do not reclassify existing Class F weights due to the difficulty of performing compliance evaluation.

This change is taking place to accommodate for the increasing accuracy of weighing devices used for legal metrology. Class F weights are no longer sufficient for the calibration, inspection, or sealing of weighing devices used for the jewelry, marijuana and pharmaceutical industries. Similarly, hydrogen for hydrogen vehicles is being sold by weight, which demands a high level of accuracy.

Rice Lake

Rice Lake Calibration masses Rice Lake Weighing Systems is an international leader in the manufacture and distribution of weight-related products and process-control equipment. Within this ISO 9001 registered company, progressive new technologies merge with the wisdom of industry experience and create the future of weighing through cutting-edge research and design.
We carry the full line of Rice Lake Calibration Weights Class 0, Class 1, Class 2, Class 3, Class 4, Class 5, Class 6, Class 7, Class F and many more. The Rice Lake Calibration Weights come in all difrent shapes like Grip-handle Weights, Cylindrical Weights, Screw-knob Weights, Leaf Weights, Specialty Weights, Slotted Weights, More Info Hook Weights and more.


Troemner Calibration masses Since 1838, Troemner has enjoyed a long history as the leader in the field of precision measurements. Over the years, Troemner has enhanced its reputation as being the premier company in the metrology industry by achieving ISO 9001 certification, and accreditation in our laboratories by both the National Institute of Standards and Technology (NIST) administered National Voluntary Laboratory Accreditation Program (NVLAP) and the United Kingdom Accreditation Service (UKAS). Troemner strives for excellence in every area of the business, and continues to raise the standards of the industry
We carry the full line of Troemner Calibration Weights:
Class 0 -  Ultra Class -  Class 1  -  Class 2  -  Class 3  -  Class 4  -  Class 7  -  More Info Class F and many more.


Ohaus Calibration masses Ohaus Weights are Manufactured to international standards (ASTM and OIML), Ohaus loose calibrations weights and calibration mass sets are available in a variety of styles for a wide range of uses. In addition to the conventional shapes, Ohaus also offers hooked and slotted masses for use in physics. Calibration weights for the continuous accuracy of your electronic balances are available from 1 mg to 50 kg.
We carry the full line of Ohaus Calibration Weights:
Class 1  -  Class F1  -  Class E2  -  Class 4  -  Class 6  -  More Info Class F and many more.


Sartorius Calibration masses Sartorius Weights are sold individually or as a 9-piece or 21-piece set with a Report of Traceabililty, and, for an additional nominal fee, with a certificate of Calibration.
We carry the full line of Sartorius Calibration Weights:
Class 0  -  Class 1  -  Class 2  -  Class E1  -  Class E2  -  More Info Class F1 and many more.

Adam Equipment

Adam Equipment Calibration masses Adam Equipment offers a healthy range of Weights class 0, class 1, class 2, class 3 and class 4. So you can Calibrate your Adam Equipment Scale.
We carry the full line of Adam Equipment Calibration Weights:
Class 0  -  Class 1 -  Class 2  -  Class 3  -  More Info Class 4 and many more.

Calibration Weights FAQ

Weights FAQ

What is NIST?

NIST stands for National Institute of Standards and Technology, and is a division of the United States Department of Commerce. The NIST makes regulations that manufacturers must follow to ensure industry standards. When purchasing NIST weights or weight sets you are being assured that your weights have been tested to meet their standards. NIST weights are most commonly used for commercial and legal for trade scales.

What is NVLAP?

NIST also runs the National Voluntary Laboratory Accreditation Program (NVLAP). This program evaluates and accredits laboratories in their respective fields and ensures they meet ISO standards.

What is ASTM?

ASTM stands for American Society of Testing and Materials. The ASTM is an international organization that establishes and develops methods for testing materials. ASTM weights and weight sets are made to the tolerance, construction, finish, and magnetism set by them. ASTM requires that weights be made of one piece (no fillers or air to compensate for small adjustments). ASTM weights are recommended for calibrating other weights or high resolution balances.

What is OIML?

OIML stands for Organization Internationale de Metrologie or better known as The International Organization of Legal Metrology. OIML is an international organization that sets guidelines for legal metrology. (Metrology involves measurement, measurement devices, and procedures.) OIML guidelines encompass everything from how the weights are manufactured to how they are to be used in calibration procedures.

What is a traceable certificate?

Many weights and weight sets are available with traceable certificates as an additional option. These certificates are issued by laboratories and manufacturers that are accredited by NIST/NVLAP, ASTM, and/or OIML depending on the type of weight, manufacturer, and class. These certificates are traceable to NIST and contain information such as type of weight, weight class, density, uncertainty, and environmental conditions at the time of calibration.

What is a certificate of calibration or calibration report?

This report is similar to the traceable certificate however it will have a smaller uncertainty and more precise values. This has to do with the methods involved as well as the number of times the tests are repeated.

What is a traceable mass value report?

This report is traceable to NIST and reports the actual weight values, tolerances, and uncertainties. However the ratios reported are not guaranteed and is not considered an accredited document.

What is a certificate of accuracy?

A certificate of accuracy is not accredited or traceable. This report is required to be completed to NIST standards and will have an NIST report number. This report will contain the weight or weight sets serial number, description, nominal value, class and tolerance.

Do I need a certificate for my weight(s) or weight set(s)?

This depends upon your needs and requirements. You need to check with your governing agency, quality control department, or product literature. Usually if dealing with ISO-9000 requirements you will need some form of an NIST traceable certificate.

How often do I need to have my weight(s)/weight set(s) calibrated?

There is no set industry standard, but it is recommended that it is done annually.

What class weight/weight set do I need?

Class 0, Class 1, E1, E2- These weights are the most sensitive and accurate. These require clean environments and special handling. These classes would be used to calibrate Class I/II balances, balances accurate as 0.001mg, and as a laboratory standard. These classes are considered to be of extra-fine accuracy.

Class 2- This class is considered to have a fine accuracy and designed for Class II balances. This class would be recommended for balances that are as accurate as 1mg.

Class 3- Recommended for analytical balances as accurate as .01g.

Class 4- Recommended for semi-analytical balances accurate to 0.1g. These are ideal for balances in school laboratories and industrial settings.

Class5, Class 6, and Class 7, Class F- These classes would be ideal for industrial and harsh environments. These are most often used for scales used in the home and production settings.

Individual Calibration Weights By Class
Calibration Weights By Class

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