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Features: Based on SCM design, fast response time and sampling: 2.5 times/second. With temperature & humidity semiconductor sensor, high in accuracy. LCD display with white backlight, clear to see temperature, humidity, wet bulb & dew point temperature, maximum & minimum value. Dual display of temperature and humidity, easy to exchange between ℃ and ℉. Other functions: data hold, auto power off after 15 minutes, low power indication. The vane part is spinning for better measurement. Can be widely used in the field of laboratory, industrial, engineer, construction and other professional circumstance etc. Specifications: Humidity Range: 0 to 100%RH. Humidity Accuracy: ±3%RH (at 25℃,20%~80%RH). Temperature Range : -40 to 105℃ (-40 to 221℉). Temperature Accuracy: ±0.5℃/±0.9℉ (at25℃) ±0.8℃/±1.5℉ (at another). Dew point Temperature: -40 to 105℃ (-40 to 221℉). Wet Bulb Temperature: 0 to 80℃ (-32 to 176℉). Resolution : 0.01% RH, 0.01℃/0.01℉. Response Time: %RH, 0.5ses. Operation temperature: 0 to 50℃ (32 to 122℉). Operation humidity: 10 to 90%RH. Storage temperature: -10 to 60℃ (14 to 140℉). Storage humidity: 10 to 75%RH. Item size: 22 x 3.5 x 5.5cm. Net Weight: 120g (Without Battery). Power by: 9V/6F22 Battery (Not Included). Package included: 1 x NKTECH Temperature & Humidity Dew Meter. 1 x NKTECH TL-1 Screwdriver. 1 x English User Manual. 1 x Carrying Bag.