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Extech Hygro Thermometer Psychrometer

Check the humidity, temperature, and weather conditions easily with the Extech RHT510 Hygro-Thermometer Psychrometer. This meter can display temperature readings (Air and Type-K), relative humidity, wet bulb, and dew point. The included bead wire Type-K probe can be used to measure temperatures up to 250°C (~480°F), but the meter can measure to 1300°C (2372°F) if used with other probes. Recall highest and lowest readings with the Min/Max function. The RHT510 also features a backlit LCD that displays Data Hold and Auto power off with disable option.

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  • Specifications


Dew Point -13.5 to 120.0°F (-25.3 to 49.0°C)

Dew Point Max Resolution 0.1°

Relative Humidity 10 to 95%

Relative Humidity Basic Accuracy ±4%

Relative Humidity Max Resolution 0.1%

Temperature (Air) 32 to 122°F (0 to 50°C)

Temperature (Air) Basic Accuracy ±2.5°F (1.2°C)

Temperature (Air) Max Resolution 0.1°

Temperature (Type K) Max Resolution -148°F to 2372°F (-100°C to 1300°C)

Temperature (Type N) ±0.4% + 1.8°F (1°C)

Temperature (Type N) 0.1°

Wet Bulb 22.2 to 120°F (-5.4 to 49.0°C)

Wet Bulb Max Resolution 0.1°

Dimensions 3 × AAA (1.5V) batteries

Manufacturer Warranty 2 years

Weight 5.6oz (160g)