Absolutely terrible device! The probes never reset, the BS resistance value jumps up and down on brand new shorted probes out of the box. Reads very slowly. After trying this junk I have doubts about the reputation of the Testo brand. This masterpiece should never have left its factory. It's comfortable to hold, a large display, la-di-ja, but that's all. Oh yes, dessert: To switch between voltage and current measurement, you have to unplug the red probe and plug it into another socket - there you have your "one". Control via hand button” All other measurements are switched internally via a relay. I have no idea which idiot designed/designed this multimeter.