Yep I use mine regularly too just to check everything is as it should be! I had a faulty neutral lead a few months ago that it picked up, it was only held together with a couple of strands of wire inside the probe end and would of given some interesting readings!!
I used the Calcard monthly, along with Zs & RCD testing on the same socket in my house, and recorded the monthly results. Enough for the annual assessment, and only needed my MFT calibrated every 3 years.
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