Voltage Testers and 2 pole Testers.
Everyone needs a voltage tester, Voltage testers are available in many ranges and at many prices. Some have LED voltage displays, while others have digital LCD readouts, giving accurate voltage readings. Models available From Fluke, Martindale, Kewtech, Tietzsch, and many other brands. Some are available as kits, along with a proving unit to ensure safe working.
Keep a voltage tester in your tool box.
These are sometimes refered to as 2 pole testers.
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