PCE Instruments PCE-444 Handheld Hygrometer, for HVAC Monitoring, Measures Humidity 0 … 100% RH & Temp -20 … 60°C / -4 … 140°F, with Dew Point, Wet Bulb, Min/Max & Data Hold

Measuring range of temperature: -20 ... 70°C / -4 ... 158°FMeasuring range of relative humidity (RH): 0 ... 100% RHMeasuring range of dew point temperature: 20 ... 70°C / -4 ... 158°FMeasuring range of wet bulb temperature: 20 ... 70°C / -4 ... 158°FMeasuring accuracy of temperature: ± 1.0°C / 1.8°FMeasuring accuracy of relative humidity: 45 ... 75%: ± 3.0% RH, otherwise: ± 4.5% RHMeasuring accuracy of dew point temperature: ± 1.5°C / 2.7°F at 25°C / 77°F, 40 ... 70% RHMeasuring accuracy of wet bulb temperature: ± 1.5°C / 2.7°FResolution of temperature: 0.1°C / 0.18°FResolution of relative humidity: 0.1% RHResolution of dew point temperature: 0.1°C / 0.18°FResolution of wet bulb temperature: 0.1°C / 0.18°FAutomatic shutdown: After 15 minutes of inactivity (can be disabled)Operating temperature: -20 ... 60°C / -4 ... 140°FStorage temperature: -20 ... 60°C / -4 ... 140°FPower supply: 3 x 1.5V AAA batteriesBattery life: Approx. 50 hours of continuous use at full chargeDimensions: 168 x 56 x 30.5 mm / 6.6 x 2.2 x 1.2 inWeight: 75 g / <1 lb

• Measures air temperature, relative humidity, dew point temperature and wet bulb temperature
• Temperature units displayed in degrees Celsius (°C) and degrees Fahrenheit (°F)
• Minimum, maximum and hold functions
• Easy-to-read backlit LCD screen
• Low-battery indicator