Quickly measure relative humidity, dew point and dry bulb temperatures Dual display: lcd with back light to show both relative humidity and temperature Fast response tie: within 60 seconds Apo function: auto power off in 10 minutes by manual setting Dew point Max/min/hold °c / °f switchable Measurement range: humidity: 10%to 95%, temperature: -20 to 60°c (-4 to 140°f) Pen type: easy to carry and use Application: professional-grade instruments for hvacr, wine cellar, greenhouse, warehouse, lab and so on