Auto null function Great for Electricians and DIY enthusiasts. No more rummaging in your tool bag for your socket tester! Intended for keeping your socket tester in good condition NOT ELECTRICAL USE. *Tester not included* I can match to the main power tools eg. Milwaukee, Makita, Bosch, Dewalt and Ryobi or message me if you would like a different colourway. I can do most colours
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