What are laboratory weights used for? What should I pay attention to?

1. When using, do not pinch by hand, only use tweezers or wear gloves to take it.

2. It is strictly forbidden to contact corrosive substances.

3. Avoid collision or drop, and avoid bumps or scratches.

4. When using weights, "bigger first and then smaller". For example, to weigh an item of about 35g, first, take a 50g weight, if the pointer is to the right, remove the weight and replace it with a 20g weight, if the pointer is to the left, add a 10g weight, the pointer is still to the left, and then Add 5g of weight. In this way, until the mass is measured.