A replacement for a similar tool which now costs well over £10. This fit the bill perfectly. It isn't as robust as the picture might suggest, and it won't be the most durable tool ever, hence 4* not 5*. But, hey, at under £3 don't hesitate, just buy one, it isn't going to be in use, day in, day out. It only has to tell you that a very small number of batteries haven't yet reached the end of their life and it's paid for itself. Very good!