2 sentences

1. 这个实验需要使用精密的天平。

   zhè gè shí​yàn xū​yào shǐ​yòng jīng​mì de tiān​píng.

   This experiment requires the use of a precision balance.

   Source: Dong Chinese Dictionary

2. 天平上的砝码不能用手直接拿。

   tiān​píng shàng de fǎ mǎ bù néng yòng shǒu zhí​jiē ná.

   The weights on the balance scale should not be handled directly by hand.

   Source: Dong Chinese Dictionary