Test weights

All counting scales can be calibrated using the internal software, and a certificated test weight.
To achieve optimum accuracy from the scale, it should be adjusted in locality where it is used, because the latitude and altitude affect the calibration and the strain gauge cell could go out of adjustment during the transportation.

OIML weight classes:
Class E1

• Weights intended to ensure traceability between national mass standards (with values derived from the International Prototype of the kilogram) and weights of class E2 and lower.
• Class E1 weights or weight sets shall be accompanied by a calibration certificate

Class E2

• Weights intended for use in the verification or calibration of class F1 weights and for use with weighing instruments of special accuracy class I.
• Class E2 weights or weight sets shall be accompanied by a calibration certificate.
• They may be used as class E1 weights if they comply with the requirements for surface roughness, magnetic susceptibility and magnetization for class E1 weights, and if their calibration certificate gives the appropriate data.

Class F1

• Weights intended for use in the verification or calibration of class F2 weights and for use with weighing instruments of special accuracy class I and high accuracy class II.

Class F2

• Weights intended for use in the verification or calibration of class M1 and possibly class M2 weights.
• Also intended for use in important commercial transactions (e.g. precious metals and stones) on weighing instruments of high accuracy class II.

Class M1

• Weights intended for use in the verification or calibration of class M2 weights, and for use with weighing instruments of medium accuracy class III.

Class M2

• Weights intended for use in the verification or calibration of class M3 weights and for use in general commercial transactions and with weighing instruments of medium accuracy class III.

Class M3

• Weights intended for use with weighing instruments of medium accuracy class III and ordinary accuracy class IIII.