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5/5

Posted by GAry Bowles (Amazon) on October 23, 2016

A simple and effective way to keep tracks of results on your tester

5/5

Posted by stevefiler0 (eBay) on October 5, 2016

A great way of self testing my meters for reassuring accuracy.

5/5

Posted by Gary (Supplier) on January 1, 2014

used these cards for years found them to be very accurate ideal for onsite checks.Brought a new one as original one was stolen