Have begun to measure and indeed my freezer. Did this run overnight and then bekerkt that the measurement time was 5 hours. Bin then have guessed that the freezer's only for cooling turns on itself. And it is measured by the meter and only time where the device is turned on. That means you need to know that this really is the operating hours and not to the measurement time. This is run on all devices to which not all the time. These are timed devices such as refrigerator, freezer, toaster. On the one hand a disadvantage because you have to write down the amount of time the "real" measurement, on the other hand an advantage because you can read the operating hours of the equipment. The reset is also really annoying. It is indeed the first set you have to enter the deal, but after each reset, this can be done. Reset to another key and press this long would not have been bad.