3-72 V Wide Testing RangeCompared with the Normal 48v/60v Test Light on the Market, this professional automotive circuit tester light has been upgraded to 3-72 DC voltage testing range, widely and ideal for checking various vehicles¡ electrical circuits, automotive headlights, taillights, turn signal circuits, faulty sockets, fuse connections, also for testing other 3-72v DC wirings and circuits. Light Indication Bidirectional Voltage TestingAs a bidirectional volt tester, you can attach the alligator clamp either to negative ground or positive pole. There are two different light emitting diodes on the circuit board for polarity indication, red light indicates positive polarity and green light indicates negative polarity. Computer Safe Accurate LCD Digital ReadingIlluminationLCD voltage display& LED Indication with.1V resolution ratio provides high accuracy accurate volt readouts. Clear & Visible Digital Readouts for Day and Night,Under Handle Light Could Light Up the Testing Area When