Capable of measuring earth voltage (V A.C.) 2mAmeasuring current permits the testing of earth resistance without trippingearth  leakagecurrent circuit breakersin the circuit.Auto power off function. The timer operates auto power off function. The time operates the “PUSH BUTTON SWITCH” and “TIMER ON BUTTON’ are pressed together. This will keep the test “NO” for about threeto five minutes. Thenautopoweroff.