A simple data logger that's what makes what is. The price is unfortunately quite high! As is well-deserved strong on the part! But, there is an alternative? Here's my experience with Windows 7: For me the little thing right from the start running without any problems. However, Windows7 in the 32bit Version! (Read the manual) but here after installation as described really without complications. I have to complain about the low and roughly graded number of measurement points. Either this should be entered manually or be more finely. This would also be good battery life. For example, a jump from 100 to 500 for me in many measurements just too much! Even the jump from 10min. to 30min. is not always useful. These settings should be adjusted manually. Then you could adjust the measuring process wonderfully to the circumstances!