GFCI outlet tester detects the most common wiring problems in standard or GFCI receptacles. The tester shows conditions such as: correct wiring, open ground, reverse polarity, open hot, open neutral and hot/ground reversed. It is simple to use. Just plug it in and different lighted indicators will show the wiring condition. The GFCI outlet tester can be used on all 125 volt receptacles with grounds. For GFCI receptacle test, push button according to enclosed instructions. This is an indispensable troubleshooting testing tool because it is so easy to use. It is also the fastest way to check that power is on and wiring is correct to all the receptacles in a new installation.
A good lockout tagout method is to first verify power is on to the circuit that will be worked on. Then when the circuit breaker is turned off, verify that the power is off. This will confirm that the correct circuit breaker was turned off. Then place the Panel Lockout onto the panel to keep the circuit breaker locked off while work is being done.