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.
We use an approved courier for delivery, typically delivered within 3-5 days from order. All orders over £150 are free and £3.50 for all other orders. Shipping is UK Mainland only.