Class F1/M1 Calibration Weights

The standard weights are professional metrological accessories specifically designed for calibration and verification of electronic scales and all types of weighing instruments. Products are manufactured in strict compliance with OIML international recommendations and JJG99 "Weights" verification regulations, ensuring that every weight is accurate, reliable, and traceable to national standards. Accuracy Class Guide (from highest to lowest precision): E1 ：National metrology reference, metrology institutes, highest-precision standard transfer E2： Precision laboratories, research institutions, high-precision analytical balance calibration F1： Laboratory routine calibration, industrial precision measurement F2： Industrial precision measurement, general laboratory calibration M1： Electronic scales, floor scales, crane scales, forklift scales calibration M2： Large-capacity industrial weighing instruments, port floor scales. Package Contents (for standard sets): • Weight main body (configured per set specification) • Protective case/storage box (optional) • Tweezers/pick-up tool (optional) Usage Notes: Ensure weight surface is clean before use; avoid oil and dust contamination that may affect accuracy. Use dedicated tweezers or gloves when handling weights to prevent corrosion from hand perspiration. High-precision weights (E1/E2 class) should be protected from impacts and drops, and stored in dedicated protective cases. Regular periodic verification at metrology institutions is recommended to ensure accuracy. Cast iron weights require rust prevention treatment and should be stored in a dry environment.