Wide range of specialtiesProfessional digital circuit 3-48V tester is specially designed for automotive circuits, car batteries, battery charging systems, and ignition systems Safer and More DurableEquipped with pure copper clips and insulating protective cover, which can better clamp the body and screws, and the insulation protection prevents electric shock. The circuit board has circuit protection function, which is safer and more resistant to burning More Convenient to Use and CarryAdopt high-quality 140 inches 3.6 meters long enough PU spring cord and large size alligator clip for easy one-handed operation. The sharp stainless steel probe has a protective rubber tip for piercing the wire, also for tight hard-to-reach areas. Coil spring cords are lighter and easier to carry than cable cords. More Expandable and StretchableAdopt 140 inches high extended spring wire, made of sharp stainless steel probe for piercing wire, suitable for hard-to-reach areas. Ideal for checking vehicle voltage values, positive and negative poles, circuits and wiring, More Quality Assurance and WarrantyThe LED digital circuit tester is made of acetate fiber, which has high toughness and is shatterproof.