My old instrument forgot all his collected data as soon as I pulled it out of the socket. So was difficult to determine what had because now consumes the connected device. This energy cost meter "Cost Control" of Technoline a battery is included so that the measurement data are always available. That was a prerequisite for the purchase of this product. Furthermore, ease of use was promised and I was not disappointed. Enter unpacking costs Euro per kw / h and connect onto any device. Now is measured. I can read current and highest wattage as well as the costs caused by the device; including extrapolated to 1 month or 1 year. The longer you can connect the instrument, the more accurate this information. I recommend it unreservedly!
