Hniuyun Circuit Tester, 3.5-36V DC Power Tester with 4.5M Cable & LCD Blue\nDescription\nWide range applications,professional diagnosis. With all these practical functions, helps the user faster and more accurate understanding of the vehicle problems.The car circuit tester can be used as electrical tester, breaker finder, power tester, wire tester, car fuse tester, continuity tester, Short Finder, automotive multimeter, etc.The premium metal probe is corrosion-resistant and offers superb conductivity. You can use the surface probe in front of the tester to detect the unknown polarity contact on the car, check whether it is charged or positive polarity (LED bright red) or negative polarity (LED bright green)Unplug the tester connection wire. The red clip is connected to the positive terminal of the battery, and the black clip is connected to the negative terminal of the battery; there upon the blue digit shows the current battery voltage value, and turn on the front light; connect0