Key features

• •🚘𝗠𝗼𝘀𝘁 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗮𝗹 𝗖𝗶𝗿𝗰𝘂𝗶𝘁 𝗧𝗲𝘀𝘁𝗲𝗿：With the GT103 probe tester, you can test for continuity/polarity/voltage and ground signals/Short&Open Circuit. And most importantly, you can also use it to check switches, relays and the on-off of diodes, fuses and circuits, activating electronic Component. It is the best electrical tester for reducing diagnostic time in all 6-30 volt vehicle electrical systems.
• •🚘𝗣𝗼𝗿𝘁𝗮𝗯𝗹𝗲 𝗔𝗻𝗱 𝗤𝘂𝗶𝗰𝗸 𝗧𝗲𝘀𝘁 𝗘𝗹𝗲𝗰𝘁𝗿𝗶𝗰𝗮𝗹 𝗧𝗲𝘀𝘁𝗲𝗿：With the GT103 car circuit tester tool, you can determine at a glance whether a circuit is positive, negative, short or open; Test for continuity with its built-in auxiliary ground lead; can also easily test the vehicle's headlights, turn signals, lift windows, sunroofs and others, helping you to find out whether it is a circuit problem or a component damage.
• •🚘𝗖𝗮𝗿 𝗙𝘂𝗲𝗹 𝗜𝗻𝗷𝗲𝗰𝘁𝗼𝗿 𝗧𝗲𝘀𝘁𝗲𝗿 & 𝗖𝗹𝗲𝗮𝗻𝗲𝗿：Free DIY Injector Cleaning Adapter Kit included with the package! When the vehicle has difficulty in starting, acceleration and fuel consumption, etc, it is necessary to check the fuel injector. When the injector is clogged, you can also use it to save expensive nozzles, this kit is easily to clean most car motorcycle fuel injectors. Efficient & Labor-free, Save your money!
• •🚘𝟮𝟬𝗳𝘁 𝗟𝗼𝗻𝗴 𝗧𝗲𝘀𝘁 𝗟𝗲𝗮𝗱：The GT103 Circuit Tester features a long 20-foot (6m) cable that allows you to test from the front to the rear of the vehicle (trucks, trailers, vessels, tractors and other vehicles that use DC circuits) without constantly searching for suitable vehicle grounds, so easy to check the whole electrical circuit system.
• •🚘𝗖𝗶𝗿𝗰𝘂𝗶𝘁 𝗢𝘃𝗲𝗿𝗹𝗼𝗮𝗱 𝗣𝗿𝗼𝘁𝗲𝗰𝘁𝗶𝗼𝗻：The GT103 Circuit Tester provides more safety for the user because it is protected by a 10-amp circuit breaker. If overloaded, it will trip and automatically disconnect the protection circuit. The circuit breaker is a valuable test tool as well as a safety measure to protect the tool from overload and make the product more durable.
• •🚘𝗟𝗲𝗱 𝗜𝗻𝗱𝗶𝗰𝗮𝘁𝗼𝗿&𝗕𝘂𝘇𝘇𝗲𝗿 𝗣𝗿𝗼𝗺𝗽𝘁 𝗙𝘂𝗻𝗰𝘁𝗶𝗼𝗻&𝗛𝗶𝗴𝗵𝗹𝘆 𝗦𝗲𝗻𝘀𝗶𝘁𝗶𝘃𝗲 𝗣𝗿𝗼𝗯𝗲：In order to help you clear problems at a glance, the power circuit probe tester comes with two LED indicator and a buzzer. The test light adopts advanced high sensitivity probe, which provides you quick and accurate detection.