PYLE Meters PTHM20 Temperature and Humidity Meter with Dew Point and Wet Bulb Temperature Temperature and humidity meter with Dew point and wet bulb temperature,9V battery Auto power off prevents unnecessary power drainage The fast response time with dual display ensures an accurate reading Auto Power Off - Humidity Range: 0-100%RH - Air Temperature Accuracy: +/- 0.5 C @ 25 C - Storage Temperature: 14F to 140 F, &lt;80% RH Fast Response Time - Temperature Range: -30 - 100 C / -22 - 199 F - Resolution: 0.01% RH, 0.01 C/F - Dimensions: 8.98-Inch H x 2.17-Inch W x 1.30-Inch D Dew Point Temperature - Dew Point Temperature: -30 - 100 C / -22 - 199 F - Response Time: %RH: 105 (90% at +25C still air) - Weight: 6.77 oz Dual Display Temperature & Humidity - Wet Bulb Temperature: 0- 80 C / 32 - 176 F - Battery Type: 9V (Included) Data Hold Function - Humidity Accuracy: +/- 2% RH - Operating Temperature: 32 F to 104 F, &lt;80% RH