Review on Thomas Traceable Hand Digital Barometer by Ryan Foles

DO NOT purchase if you intend to use it as a barometer or thermometer. The first block differed in temperature by 8 degrees and in atmospheric pressure by 11 mb. So I returned it and got a replacement, the second block temperature was closer, within a few degrees, but the atmospheric pressure was still at 10mb. Neither temperature nor barometric pressure can be calibrated. It can still work as an altimeter as you can tweak it, but for my intended use as a barometer it's useless.