Mini Pocket Temperature Humidity RH Meter Wet Bulb Dew Point Tenmars TM-730  Product Description:  - Measuring humidity, temperature, wet bulb and dew point - Quick-response capacitance sensor - Max/Min/AVG and Data Hold - Auto power off and disable function - Low battery indication - Dual LCD display          Application:     HVAC inspection            Specification:            Temperature ranges: -20C~50C / -4F~122F     Temperature Accuracy: +/-1C / 1.8F     Temperature Resolution: 0.1C / 0.1F     Temperature update rate: 500ms Dew point and wet bulb function     Relative humidity accuracy: +/-3.5% @25C for 20% ~90% RH +/- 5% for 1%~19.9% and 1%~99%RH     Relative Humidity Resolution: 0.1% RH     Second Relative Humidity response time:  below 10 seconds     Power: 2 batteries 1.5V AAA (not included package)                         Dew point and wet bulb function: 1.Relative humidity accuracy: +/-3.5% 25C for 20% ~90% RH +/- 5% for 1%~19.9% and 1%~99%RH 2.Relative Humidity Resolution: 0.1% RH 3.Second Relative Humidity response time: below 10 seconds 4.Power: 2 batteries 1.5V AAA (included)                   DIMENSION:       1.Size :107mm x48mm x23mm(L*W*H)       2.Weight (excluding battery) : 80g