Double-casting plastic shell, compact shape light, easy to use Shuangping, with backlight, fast response to temperature and dew point wet bulb temperature of the test fast response, high-precision data and maintain the function of the maximum temperature / humidity Resolution: 0.01 ℃ / 0.01% RH Size: 255 ?45 ?33 mm Weight: 200 grams (with battery) Accessories: 9 V batteries, built-in tool box Humidity: 0 ~ 100% RH.  2% RH Temperature: -30 ℃ ~ 100 ℃, 22 ℉ ~ 199 ℉.  0.5 ℃ / 0.9 ℉. -20 ℃ ~ 60 ℃, -4 ℉ ~ 140 ℉ Dew point temperature: -30 ℃ ~ 100 ℃, 22 ℉ ~ 199 ℉.  0.5 ℃ / 0.9 ℉ Wet bulb temperature: 0 ℃ ~ 80 ℃, 32 ℉ ~ 176 ℉ .  0.5 ℃ / 0.9 ℉