Features: Induction alarm: The built-in sensor of the test pen when detecting the nearby AC voltage the red light will flash. Judgment of line breakpoint: When the line is electrified the line is open one section of the wire is electrified and the other section is not (or may have a weak voltage) the breakpoint can be detected. Humanized pen clip: The humanized pen clip on the back of the voltage tester can be conveniently clamped on the belt or pocket. Screwdriver design: This voltage tester takes the shape of scredriver and you can use it to drive the screws. LED high brightness lamp bead: The lamp bead is high brightness and the luminous lamp bead can be seen clearly under the sun. It has a longer service life than ordinary bulbs. Usage method: Find breakpoint: Find the breakpoint along the line. When the red light goes out it is the breakpoint. Find the zero fire line: The pen head is inserted into the hole. When the red light is not on it is the zero line. When the pen head is inserted into the hole it is the fire line when the red light is on. Specifications: Measuring range: 70-250v Material of cutting head: CR-V alloy steel Length: 140mm Slotted bit: 3mm External leakage screwdriver bit: 15.5mm includes: 1 *Electrician Voltage Tester Screwdriver "