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Mains Polarity Tester
An absolute must in the caravan! You should always check the polarity of the on site electrics before you connect your appliances to them. Why?
Because if it's reversed you could easily be electrocuted
Simply plug this tester into a socket in your caravan and the easy to use display will reassure you that everything is okay.
Please note - the image shown is a library image and the product supplied may vary in appearance
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