"Looks a useful tool which I bought as a present. Ordered on-line for pick up. First one was un-packaged and in pieces with labels missing that tell you how to work it. Replacment item picked up following day (now not such good value due to travel costs). Labels coming off again and writing too small. Basically - if you don't know how it works, trying to find out is frustrating. Oh, and by the way, it takes 4 watch type flat batteries."