1.[EXPANDED VOLTAGE CAPACITY & EXTENSIVE USE] electrical tester features a wider testing range of 5V-120V, quickly tests car battery voltage and diagnoses issues, including alternator tester functionality for car/truck/SUV/boat charging systems. Also to inspect circuit tester integrity of headlights, taillights, fuse connections and more. 2.[CLEAR DIGITAL DISPLAY & PRECISE READOUTS]Bright LED display shows highly clear readings in any lighting condition, 0.1V resolution gives you clearly visible digital readouts. Bidirectional light emitting diode on the circuit board for easy battery load testing, red light indicates positive polarity, green light indicates negative polarity. 3.[FLEXIBLE SPRING WIRE & LARGE ALLIGATOR CLIP]High quality 96 inch long enough spring wire increases flexibility when testing and anti-bending design of the tail wire makes no worry about bad of the line. Attaching with large size crocodile clip for convenient one-handed operation, which is boosting the efficiency for car battery capacity checks and beyond. 4.[COMPUTER SAVE & ULTRA-DURABLE] This premium car fuse tester has a built-in circuit board chip and equipped with plastic handle to provide better grip and insulation protection against electric shock. Robust stainless steel probe pierces insulation with ease, also for hard to reach tight areas. Ensuring reliable battery meter and circuit analysis for your operation.