1,Contact Type: This is a contact type electric test pen, easy to operate and convenient to carry. It can bring a lot of help for your work. 2,Operating Procedure: NCV inductive probe for alternating current voltages is applied. Simply place the tip near a terminal strip, outlet or power cord. You can know there is voltage when the tip is red glowing and the tip makes a beeping sound. 3,Breakpoint Testing: The test detector automatically detects wires or neutral wires. Perfect for breakpoint testing. 4,Red and Green Lighting: This test pen will beep at a higher frequency. Meanwhile, the screen is red or green, red means high voltage and wires are detected, green means low voltage and empty wires are detected. 5,Scope of Application: More sensitive and flexible measurement. Press the S button to adjust the sensitivity, and adjust the low range for thermostat, irrigation wiring, etc.