Our CONTINUITY TESTER gives an audible indication of continuity between the probes so you can keep your eyes on the probe tip. Secondly its response-time is very short so that you can make lots of tests very quickly while listening for the beep.
And thirdly it only responds to a definite short circuit or one that has a resistance of 50 ohms or less. It will not respond to values above 80 ohms or the voltage drop across a diode.
As we mentioned, the circuit detects resistance values of 50 ohms or less between the probes and allows an oscillator to turn ON and produce a tone from the piezo diaphragm.
A LED is also included on the board to indicate when the unit is ON as the circu