Handle weights with care.

2. Before use, clean the surface dust of the weight with a soft brush or cloth.

3. Check the weights inside the box before and after use to prevent loss.

4. Weights should be properly stored and not placed in a humid and dusty environment.

Do not handle weights with bare hands; use tools to remove weights when using them.

6. Before calibration, the weights must be maintained at a constant temperature to meet the laboratory's temperature conditions.

7. All sets of weights must not be mixed with other weights.

Avoid using thick acids, bases, and greases during use.

9. After use, clean the weights with alcohol, allow them to air dry naturally, and store them in the original packaging box for future use.

10. Weights should be calibrated regularly based on usage frequency, and calibration records should be kept.

11. If there's an issue with the weight performance, it should be immediately sent to a testing facility for inspection.