The Loopcheck 106 and 107 are unique in that they are the only socket testers that carry out a loop test at mains frequency to check the actual condition of the wiring. Particular emphasis is placed on detecting very dangerous wiring conditions such as reversed live earth connections, disconnected wires and high earth value
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Kewtech 106 and 107 loop tester user manual 2016-08-21
Instructions for use of Kewtech 106 and 107 miniature loop testers