Weighting requirements and precautions:

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

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

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

4. The surface of the weights should be kept clean, and they should be regularly cleaned with a soft brush to remove surface dust. If there are any stains, they can be cleaned by wiping with a cloth dampened with absolute ethanol.

5. If weights fall and are damaged, or if they develop oxidation stains or loose at the scale, they must be immediately inspected. Only after confirmation of their quality can they be used.

6. Calibrate weights regularly based on their frequency of use, typically no more than once a year.