It is important to know! When you are messing with electrical wire, plugs, etc this little gadget is Very Important cause it checks HOT wires for you, I come from the old school whereas a handyman you think you can do just about anything with no knowledge of what you or trying to do, I have been close to getting shocked and I am 79 years old, so be "SAFE NOT SORRY"!
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Enhanced North American AC Electrical Outlet Receptacle Tester - Klein Tools RT110
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VT500 Voltage Tester: 12V-300V Non-Contact & Contact, LCD Display, Buzzer Alarm & Wire Breakpoint Finder
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