The voltage detection test pen judges the positive and negative poles of the direct current.
Connect the test pen to the DC circuit to test, the neon bulb that glows is the negative pole, and the non-lighting pole is the positive pole.
The voltage detection test pen judges the positive and negative poles of the direct current.
Connect the test pen to the DC circuit to test, the neon bulb that glows is the negative pole, and the non-lighting pole is the positive pole.
