Waste of money. I really wanted to use it to get the cable length. If you enable this, the metric will be used by default. That would be nice, but I'm an American stuck in the imperial system. If that was the only problem, that would be perfectly fine. It is not. Distances are long. Recalibration is possible, but does not eliminate the problem of deviating readings. The way it was packaged and when I received it almost led me to believe it was a used product. The screen is dimmed, the device has scratches/smudges. This could be because the device was poorly packaged when the large and small devices were in the same bubble wrap which was not well protected.