The indoor temperature range is +14.2ºF~+122ºF, the outdoor temperature range is -9.9℃~50℃(14.18˚F ~ 140˚F ),the indoor/outdoor humidity range is 10~99%, the temperature accuracy is +/-0.5ºF the humidity accuracy is +/-1% Air atmospheric pressure display range: 600 hPa/mb~1100 hPa/mb&17.72inHg~32.48 inHg; Air atmospheric pressure display resolution: 1 hPa/mb&0.03 inHg; Air atmospheric pressure unit selection: mb/hPa or inHg;