Weighing scale usage requirements and precautions:

Each scale should come with a set of weights. Within a set, weights of the same nominal mass may have different true 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 can only be placed inside their packaging box or on the weighing pan, not on any other surface.

4. The surface of the weights should be kept clean, and the surface dust should be regularly removed with a soft bristle brush. Any dirt can be cleaned by wiping with a cloth dampened with alcohol.

5. If weights fall and sustain damage, develop oxidation stains, or the scale head loosens, they must be immediately inspected. Use only after confirmation of their qualification.

6. Regularly calibrate weights according to their frequency of use, typically no more than once a year.