Use a voltage tester pen within the rated voltage range
The voltage range of ordinary electroscopes is between 60V and 500V.
If it is used to test a voltage lower than 60V, the neon tube of the electroscope may not emit light, which will cause misjudgment; if it is used to test a voltage higher than 500V, it is easy to cause electric shock. 【Safe use of electroscope and correct method of electroscope】 Therefore, electroscope is only allowed to be used within the specified rated voltage range.
