Works as described. Although the batteries can be seen in the picture, they are not included for airline safety reasons. No problem, because this cheap device costs six batteries. I have extended my Schluter Ditra Heat guarantee from 10 to 15 years. It also tests up to 750VAC using the middle two terminals. External connectors are used for insulation testing. YouTube has a video showing the correct operation and also a video showing the wrong operation. While the instructions may be a bit complicated for some, you can get the hang of it. Excellent product at a tenth of the price for a few meters. Also arrived on time with Revane Prime. Many Thanks.
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