If it hadn't been on sale, so that the cost was very low, I would return it. As it is, it is not worth the postage to return it. The gadget works as described, but has a few flaws. The biggest complaint I have is that the backlight on the meter goes out in a few seconds, so that the meter is very hard to read unless you are in bright light. There is a switch to turn it on, which also turns on the backlight, but if you hit the switch again, trying to get the light to go again, the meter changes…