a. Before weighing, check whether the balance is normal, whether it is in a horizontal position, and whether the inside and outside of the glass frame are clean.
b. The weighing object cannot exceed the load of the balance, and hot objects cannot be weighed.
腐蚀 Corrosive or hygroscopic objects must be weighed in a closed container.
c. All weighings in the same chemical test should use the same balance from beginning to end, using different balances will cause errors.
d. Each balance is equipped with a fixed weight. Do not misuse the weights of other balances.
Keep the weight clean and dry. Clamp the weight with tweezers. Do not hold it by hand. Put it back in the weight box when you are finished.
e. After weighing, check whether the balance beam is lifted, whether the weight has been returned, whether the index plate has turned to "0", whether the power is cut off, and whether the side door is closed. Finally, cover the balance and fill in the use record.
f. Keep the inside of the balance clean frequently, if necessary, wipe it with a soft brush or silk cloth or wipe it with absolute ethanol.
g. A desiccant should be placed in the balance. The weighing must not exceed the load of the balance.