Have expanded after prolonged fret about Eberle Instat 3R this and installed the SM-PC847. In direct comparison clear advantage for the 847 because it just does what it should. There are also useful options such as temperature calibration or switching hysteresis. Einigst the number of switching times are less and a holiday function is missing. But for 20 an absolute top product. The German manual (copied blurb) is likely to be better). I'm going to buy more equipment to do so.
