OTC Heavy-duty Logic Probe Tester Multi-functional design allows testing range of 3-26 volts. The bright red and green LEDs interpret voltage signals such as ground, power, and frequency. The tests fuel injectors, solenoids, presence of serial data, and Tach reference signals. The output tests on MAF, Cam, Crank, Hall Effect VRS sensors and more. The high impedance input compatible with computer circuits and sensors. Its features and benefits include air bag safe, 12 feet, heavy-duty twin clip red coil cord lead, checks 6-12-24-volt systems, ergonomic slim designed clear handle, positive contact molded strain relief and heavy-duty stainless steel probe with insulated shaft.