PAT tester (City Centre NR1)

IRWIN Pat tester. This is about 40 years old and doesn't have a setting for smaller appliances - it sends a 25 amp current through the earth wire and measures the voltage. If this exceeds 2.5V the Earth Fault light comes on. It also applies a high voltage between conductors to test the insulation. It hasn't got a calibration certificate so you may wish to satisfy yourself that it's ok to use.