Testo750-1 - Voltage tester

Great piece of kit. The all round indicator is a godsend in confined areas

Voltage indicator marketed as German made with unique design features and premium price tag. At first sight it seems well enough made, if a little bulkier than competition. But what ultimately made it a one star product for me was its phase indication, or as the manufacturer awkwardly calls it "rotating magnetic field measurement". When put to the test in the field the unit randomly would indicate reverse phase to what was expected, and maintain this reverse result when compared to results from Fluke and Metrel testers. And just when I was tempted to believe its German pedigree - every now and then it simply couldn't decide on phase at all and just flicker manically between [L] and [R]. At that point, if you didn't have a secondary device at hand, you would spend a lot of time investigating Testo's red herrings. And if you need another tester for your tester, then well, that's as chocolate teapot-y as it gets among approved indicators your life and expensive machinery depends on, right?