Wide Circuits Tester This 12V electrical circuit tester test light is ideal for checking circuits, fuses, switches and wiring on automobiles, trailers, boats, motorcycles and other low voltage systems. Body length: 8.3 cm (3.3 in); pen length: 17.3 cm (6.8 in). Test Light Bulb The light in the handle glows when the circuit connection is complete. The 3 watt bulb is replaceable, allowing easy replacement and long life for your electrical circuit tester test light 6V. Premium Quality The handle is made of high quality AS plastic. The hardened and tempered carbon steel probe is chrome plated, so the sharp probe can pierce wire insulation to check circuitry. 6V-24V Test Range Designed to check car electrical circuits from 6V to 24V. Its lightweight design provides convenient portability, so you can carry it wherever you go. Use scenarios - In a car to verify a suspect fuse or wiring issue. - In a trailer or boat wiring harness to test circuits and switches. - During motorcycle electrical diagnostics as part of routine maintenance.