How to use a voltage tester pen to distinguish between alternating current and direct current
The electric pen measures AC and DC, and the AC is bright and DC is dark. The AC neon tube is bright throughout, and the DC neon tube is bright on one side
How to use a voltage tester pen to distinguish between alternating current and direct current
The electric pen measures AC and DC, and the AC is bright and DC is dark. The AC neon tube is bright throughout, and the DC neon tube is bright on one side
