Calibration Weight Classes will let you know the tolerance of the calibration weight you are using. There are three major governing bodies that assign classes to weights: ASTM International (Formerly the American Society for Testing and Materials), OIML (International Organization of Legal Metrology), and NIST (National Institute of Standards and Technology). However only at Troemner, we have created an entirely new class of calibration weight, the Ultra Class Series, which meets or exceeds the common standards of ASTM, OIML, and NIST.
Below you will find all of the calibration weight classes explained, how to determine what class of calibration weight you may need, and the different calibration weight classifications.
Troemner UltraClass
Available exclusively from Troemner, these calibration weights are the most precise two-piece weights available with weight tolerances that equal or exceed comparable ANSI/ASTM E617 and OIML R 111 class tolerances. Troemner UltraClass weights are manufactured, 1 g through 20 kg, from our exclusive stainless steel, Troemner Alloy 8.
Troemner UltraClass Platinum Reference Weights - The weight tolerance is equal to ANSI/ASTM E617 Class 000 and OIML Class E0*. This high precision weight class is appropriate for calibrating microbalances and high-precision analytical balances with a readability as low as 0.0001 mg.
Troemner UltraClass Gold Reference Weights - The weight tolerance is equal to ANSI/ASTM E617 Class 00 and meets or exceeds OIML R 111 Class E1. This weight class is appropriate for calibrating microbalances and high-precision analytical balances with a readability as low as 0.001 mg.
Troemner UltraClass Reference Weights - The calibration weight tolerance is equal to ANSI/ASTM E617 Class 0 and exceeds OIML R 111 Class E2. This weight class is used as a reference standard for calibrating other reference standards and is appropriate for calibrating semi micro balances and high-precision analytical balances with a readability as low as 0.01 mg.
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ANSI/ASTM E617 Calibration Weight Classes
ASTM E617 calibration weight classes are governed by ASTM International, previously known as the American Society for Testing and Materials. Most calibration weights found in the United States are defined by ASTM calibration weight classes.
ANSI/ASTM Class 000 Reference Weights - Used as a primary reference for calibrating other reference standards and calibration weights. Class 000 weights are intended to be used in metrology laboratories where the stability of the environment and careful handling are assured. ASTM Class 000 reference weights and weight sets can be used to calibrate microbalances, analytical balances, Class I and Class II laboratory balances, and ASTM Class 4, 5, and 6 weights. Class 000 weights are equivalent to OIML Class E0* weights.
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ANSI/ASTM Class 00 Reference Weights - Used as a primary reference for calibrating other reference standards and calibration weights. Class 00 weights are intended to be used in metrology laboratories where the stability of the environment and careful handling are assured. ASTM Class 00 reference weights and weight sets can be used to calibrate analytical balances, Class I and Class II laboratory balances, and ASTM Class 4, 5, and 6 weights. Class 00 calibration weights are equivalent to OIML Class E1 weights.
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ANSI/ASTM Class 0 Reference Weights - Used as a primary reference for calibrating other reference standards and calibration weights. Class 0 weights should be used in metrology laboratories where the stability of the environment and careful handling are assured. ASTM Class 0 reference weights and weight sets should be used in secondary calibration labs, manufacturing quality control, state laboratories, or similar weight calibration environments. Class 0 weights can be used to calibrate analytical balances, Class I and Class II laboratory balances, ASTM Class 4, 5, and 6 weights. ASTM Class 0 weights are equivalent to OIML Class E2 weights.
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ANSI/ASTM Class 1 Calibration Weights - Can be used as a reference standard in calibrating other calibration weights and is appropriate for calibrating high-precision analytical balances with a readability as low as 0.1 mg to 0.01 mg. ASTM Class 1 calibration weights and calibration weight set classes should be used in pharma quality control, research and development, analytical testing, chemical manufacturing, or other similar weight calibration environments. Class 1 weights can be used to calibrate analytical balances, Class I and Class II laboratory balances, and ASTM Class 4, 5, and 6 weights. Class 1 weights are equivalent to OIML Class E2 weights.
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ANSI/ASTM Class 2 Calibration Weights - Appropriate for calibrating high-precision top loading balances with a readability as low as 0.01 g to 0.001 g. ASTM Class 2 calibration weights and weight sets should be used in pharma, research and development, analytical testing, manufacturing, or other similar weight calibration environments. Class 2 weights are equivalent to OIML Class F2 weights. Class 2 weights can be used to calibrate precision balances, Class I and Class II laboratory balances, digital scales, and ASTM Class 4, 5, and 6 weights. Class 2 weights are equivalent to OIML Class F1 weights.
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ANSI/ASTM Class 3 Calibration Weights - Appropriate for calibrating balances with moderate precision and with a readability as low as 0.1 g to 0.01 g. ASTM Class 3 calibration weights and weight sets should be used in pharma, research and development, analytical testing, manufacturing, or other similar weight calibration environments. Class 3 weights can be used to calibrate precision balances, Class I and Class II laboratory balances, digital scales, and ASTM Class 4, 5, and 6 weights. Class 3 weights are equivalent to OIML Class F1 weights.
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ANSI/ASTM Class 4 Calibration Weights - For calibration of semi-analytical balances and for student use. ASTM Class 4 calibration weights and weight sets should be used in simple weighing environments and for educational purposes. Class 4 weights can be used to calibrate precision balances, Class I and Class II laboratory balances and digital scales. Class 4 weights are equivalent to OIML Class M1 weights.
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ANSI/ASTM Class 5 Scale Weights - For student laboratory use or low precision scales ASTM Class 5 scale weights and weight sets should be used in classroom settings or where simple weight calibrations are needed. A Class 5 scale calibration weight can be used to calibrate Class III digital scales and other weighing scales. Class 5 weights are equivalent to OIML Class F1 weights. Includes Grip Handle Weights, Hanger Weights, and Slotted Weight styles.
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ANSI/ASTM Class 6 Scale Weights - For student laboratory use or low precision scales ASTM Class 6 scale weights and weight sets should be used in classroom settings or where simple weight calibrations are needed. A Class 6 scale calibration weight can be used to calibrate Class III, Class IIIL, or Class IIII digital scales, or other weighing scales. Class 6 weights are equivalent to OIML Class M2 and M3 weights.
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ANSI/ASTM Class 7 Scale Weights - For rough weighing operations in physical and chemical laboratories, such as force measuring apparatus. ASTM Class 7 scale weights and weight sets should be used in environments where simple weight calibrations are needed. A Class 7 scale calibration weight can be used to calibrate Class III, Class IIIL, or Class IIII digital scales, and other weighing scales. Class 7 weights are equivalent to OIML Class M2 and M3 weights.
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OIML R 111 Calibration Weight Classes
OIML R 111 calibration weight classes are governed by the International Organization of Legal Metrology. Outside of the United States, OIML calibration weight classes are the most commonly found standards. OIML weight classes are comparable to ASTM weights.
OIML Class E0 Reference Weights - Used as a primary reference for calibrating other reference standards and calibration weights where the stability of the environment and careful handling are assured. OIML Class E0 reference weights and weight sets can be used to calibrate microbalances, analytical balances, and Class I and Class II laboratory balances. OIML Class E0* weights are equivalent to ASTM Class 000 weights.
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OIML Class E1 Reference Weights - Used as a primary reference for calibrating other reference standards and calibration weights where the stability of the environment and careful handling are assured. OIML Class E1 reference weights and weight sets should be used in calibration laboratories, metrology departments, or other similar weight calibration environments. OIML Class E1 weights can be used to calibrate analytical balances and Class I and Class II laboratory balances. OIML Class E1 weights are equivalent to ASTM Class 00 weights.
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OIML Class E2 Reference Weights - Can be used as a reference standard in calibrating other calibration weights and is appropriate for calibrating high-precision analytical balances with a readability as low as 0.1 mg to 0.01 mg. OIML Class E2 weights can be used to calibrate analytical balances Class I and Class II balances. OIML Class E2 weights are equivalent to ASTM Class 1 weights.
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OIML Class F1 Calibration Weights - Appropriate for calibrating high-precision top loading balances with a readability as low as 0.01 g to 0.001 g. OIML Class F1 weights can be used to calibrate precision balances, Class I and Class II laboratory balances, and digital scales. OIML Class F1 weights are equivalent to ASTM Class 2 and 3 weights.
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OIML Class F2 Calibration Weights - For calibration of semi analytical balances and for student use. OIML Class F2 calibration weights and weight sets should be used in classroom settings or where simple weight calibrations are needed. Class F2 weights can be used to calibrate Class III, Class IIIL, or Class IIII digital scales or other weighing scales.
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OIML Class M1, M2, M3 Scale Weights - Scale calibration weights for general laboratory, industrial, commercial, technical and educational use. Typically fabricated from cast iron or stainless steel. OIML Class M1, M2, and M3 scale calibration weights and scale weight sets should be used in classroom settings or where simple weight calibrations are needed. OIML Class M1, M2, and M3 scale calibration weights can be used to calibrate Class III, IIIL, or IIII digital scales, and other weighing devices. OIML Class M1, M2, and M3 scale calibration weights are equivalent to ASTM Class 5, 6, and 7 weights.
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NIST Calibration Weight Classes
NIST Class F Scale Weights - Primarily used to test commercial weighing devices and scale calibration by state and local weights and measures officials, device installers, and service technicians. Class F scale calibration weights and test weights may be used to test most accuracy Class III digital scales, all digital scales of Class IIIL or IIII, and other weighing scales not marked with a class designation.
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Calibration Weight Class Tolerance Chart
To better understand these international calibration weight standards, it is always recommended to reference Troemner's calibration weight tolerance chart to see the exact values of the calibration weights within their respective classes, and make sure you are using the required calibration weight for your specific industry use.