Features: 3-24V MEASURING RANGEProfessional automotive circuit tester / circuit test light for testing circuits from 3V to 24V, suitable for cars, trucks, etc. DIGITAL DISPLAYWith the design of digital display, the positive and negative poles can be digitally displayed, and the voltage can be displayed in real time, which is more convenient. LED INDICATORThe LED indicates the positive and negative poles, the red is the positive pole, and the green is the negative pole, which is more convenient. WIDE APPLICATIONSGreat for checking circuits in a wide range of vehicles, quickly checking car headlights, tail lights, turn signal circuits, faulty sockets and other wiring and circuits. SAFE TO USEFitted with a solid copper clip and insulated protective cover for better grip on the body and screws, insulated to protect against electric shock. Please note: When using an electric pen to measure electricity, it is necessary to measure intermittently, using the point-contact method, and the power-on time should not exceed 3 seconds, so as to avoid excessive power-on time and prevent the circuit board from being burned! Specifications: Material: stainless steel, ABS, etc Color: black wire: black, spring wire: black+red Type: black wire, spring wire Measuring range: 3-24V Pen body length: about 102mm/4.02inch Probing needle length: about 77mm/3.03inch Package Included: 1 pc x circuit test pen Note: 1. Due to the light and screen difference, the items color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.