High impedance electrical testing instrument for AC and DC voltage detection and continuity testing

摘要: An electrical testing instrument including a high gain amplifier circuit having pair of inputs, one comprising probe and the other covered at least in part by non-conductive material being adapted for manual engagement user completing an input through body user. The has battery current-responsive indicator its output to provide signal when current flows critical forward biasing amplifier. is connected furnish such terminals are closed resistance approximately user's body. further arranged that contacted with live AC power line engages portion manually engageable terminal which material, operating indicating will also be present circuit.