Weighted锤的使用 requirements and precautions:

Each scale should come with a set of weights. Within a set, weights with the same nominal mass may have different true values. When weighing, use those without an "*" first to minimize measurement errors.

2. Use tweezers with bone or plastic tips to pick up the weights; do not handle them with your hands directly, and avoid using alloy steel tweezers to prevent scratching the weights.

3. Weights must only be placed inside their packaging box or on the balance scale's weighing pan; they should not be placed elsewhere.

4. The surface of the weights should be kept clean; regularly remove surface dust with a soft brush. For any stains, clean with a cloth dipped in alcohol without water.

5. If weights fall and sustain damage, develop oxidation stains, or the markings become loose, they must be immediately inspected. Only upon confirmation of their suitability can they be used.

6. Calibrate weights regularly based on usage frequency, typically not exceeding once a year.