When testing, the operator simply connects to the test via the 4 mm banana plug socket. To test make finger contact with the stainless push button, and “press to test”. A green LED will illuminate for pass or the red LED will illuminate for fail. An audible buzzer will sound if the red fail LED illuminates. If the resistance through the coil cord wrist band and person exceeds 35 meg ohms the red fail LED will light, if the resistance is below 750 kilohms the red fail LED will light. If the 9 volt PP3 battery falls below 6.5 volts during test the yellow battery low LED will light.

 The product is CE approved.