I've had the ones listed above and didn't care for them, the one with the knob in front to adjust broke, I've hit the calibrate button a few times and Xikar I can't figure out how to calibrate it. In the end I went with a few of these and tossed them into a calibration kit and they were only off by 1%. That's good enough for me and ordered 2 more from fleebay, I'm getting another one once my Ebucks kick in.
I can stand 10 feet away from my tuppers and read them just fine, once my wineador is settled they will go on the face of the drawers so that I can see them from my couch. :halfgrinw