- Continuous tone for a good indication
- Warbling tone indicates a fall condition
- Advanced electronics allows clear indication even on noisy 
   circuits
- 3 colour LEDs show fault location
- Indicates goods and 17 fault conditions
- A built in self-test gives confidence of operation
- True Earth loop impedance test
- Simple loop results : LED colour GOOD, CHECK or URGENT
   CHECK
- 30mA RCD operational check
- Tests for reversed Live / Neutral at DNO service cut out
- Incoming supply polarity test
- Simple true polarity test by touching on 'POLARITY CHECK'
   pad