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This tester is mainly intended for testing 24V electrical circuits found on most recreational stuff. However, if the resistors have different values then of course the circuit can be used for other voltage ranges. For 12 V, the value of the resistor should be 1.2 kΩ, and for 48 V - 4.7 kΩ. The tester must be connected to the +ve and –ve voltage rails with a test clamp or alligator clamp, and then place the test probe on the point to be tested. When the voltage is at the positive point, the red LED will light up; if negative, green will be there. If the power supply is not grounded, the tester can be used as a ground leakage tester. In this situation, one of the LEDs lights up when the tip hits a ground potential and there is a leak.
