Apex Tool 129D Specialty Tools CIRCT TST LO VOLT

6 & 12 Volt Low Voltage Circuit Tester. Test for Voltage in 6 and 12V Systems by Grounding the Clip and Touching the Probe to the Point being Tested. Tester Bulb will Light if Power is Present. Replacement Bulb Part: 12675 (GE 1449 Bulb). .