LED TESTER LIGHT - High visibility and long service life. It clearly indicates the circuit state with LED feedback. Green light denotes positive polarity, red light denotes negative polarity. SHARP AND STURDY DESIGN - Includes a large alligator clip and two sharp, sturdy steel probes for easy one-handed operation. Reaches hard-to-access tight areas and can pierce the wire when needed. MULTI-FUNCTION TESTER - Ideal for checking a variety of vehicle circuits. Quickly assess headlights, taillights, and turn signal circuits; identify defective sockets and fuse connectors. WIDELY USED AND COMPATIBLE - The 6-24V automotive circuit detection pen is designed for maintenance of low voltage circuits in cars, motorcycles, excavators, and similar equipment. Specifications at a glance - Voltage range: 6-24V - Probes: two sharp steel probes - Clip: large alligator clip - Indicator: LED test light with positive/negative polarity indication - Construction: durable, one-handed operation design Use scenarios - Quick circuit verification while diagnosing headlights, taillights, or turn signals during maintenance or repair. - Inspect sockets and fuse connectors to locate defective components without removing wiring. - Service low voltage circuits across vehicles and equipment such as cars, motorcycles, and excavators, ensuring proper polarity and circuit operation.