① Before checking whether the electrical appliances and lines are electrified, you should first test them in a place with electricity to see if the test pen is intact, so as to prevent electric shock due to discrepancies.
②When holding the pen, press the tail of the test pen with your fingers and hold the pen body with other fingers.
③ When measuring the electricity, the tip of the pen touches the test body, and the hand touches the tail of the electricity measuring pen. Assuming that the test body is charged, the neon tube of the test pen will emit light; if the neon tube does not emit light, it means that the test body is not charged.
④The insulation resistance of the electric test pen is less than 1 megohm and cannot be used.
