Unique Design: The automotive circuit tester designs with a large clip and sharp stainless steel probe for one hand easy operation, it can detect hard to reach narrow areas and pierce wire. LED Display: The light tester comes with bright LED digital voltage display and can read out volt accurately and quickly, also can be clearly seen during the day and night. Rapid Test: 12V light tester has a 5W replaceable test light bulb on the top for high visibility and long life. Bulb can quickly detect the shorts or breaks of the electrical circuit. Working Modes: Tester designs with a switch and 12V 5W test light bulb, you can change working modes you want easily.The brightness can be changed with the measured voltage. Application: Widely used in dc voltage tester, car fuse tester, automotive battery tester, probe tester, perfect for a variety of cars, trailers, vans, RVs, motorcycles, boats, etc. Easy Using: The tester has special shell and compact size, durable Abs material, heat resistant, high tensile strength. You can take this light tester anytime and anywhere.