① This kind of test pen can not only measure AC 220V, but also 110V, and even DC as low as 12V. Please refer to the instruction manual for specific usage methods, which will not be described here.

(1) It can be used to conduct low-voltage phase verification and measure whether any conductors in the line are in phase or out of phase. The specific method is: stand on an object insulated from the earth, hold a test pen in each hand, and then test the two wires to be tested. If the two test pens glow very brightly, the two wires are different. phase; otherwise, it is in the same phase. It is judged by using the principle that the voltage difference between the two poles of the neon bulb in the electric test pen is proportional to the intensity of its luminescence.

(2) Can be used to distinguish alternating current and direct current. When testing with a test pen, if both poles in the neon bulb of the test pen light up, it is alternating current; if only one of the two poles emits light, it is direct current.

(3) Can determine the positive and negative poles of DC. Connect the test pen to the DC circuit for testing. The bright pole of the neon bulb is the negative pole, and the non-lit pole is the positive pole.

(4) Can be used to determine whether DC is grounded. In a DC system that is insulated from the ground, you can stand on the ground and touch the positive or negative pole of the DC system with a test pen. If the neon bulb of the test pen does not light up, there is no grounding phenomenon. If the neon bulb shines, it means there is a grounding phenomenon. If it shines like at the tip of the pen, it means the positive electrode is grounded. If it lights up at the end of your finger, it means the negative pole is grounded. However, it must be pointed out that in a DC system with a ground monitoring relay, this method cannot be used to determine whether a ground fault occurs in the DC system.