The Extech RHT510 is a versatile handheld psychrometer that measures relative humidity, ambient air temperature, dew point, and wet bulb temperature—plus surface or air temperature via an included general-purpose Type K thermocouple probe. Designed for HVAC, industrial, and environmental applications, it features a backlit LCD for clear viewing in low-light conditions, Min/Max recording, Data Hold, and an optional tripod mount. With its ability to calculate psychrometric parameters and support high-temperature Type K measurements (up to 2372°F / 1300°C with compatible probes), the RHT510 is ideal for comfort assessments, drying operations, and thermal diagnostics.
| Air Temperature | 32 to 122°F (0 to 50°C) | 0.1° | ±2.5°F (±1.2°C) |
| Type K Temperature | –148 to 2372°F (–100 to 1300°C) | 0.1° | ±0.4% + 1.8°F (±1°C) |
| Relative Humidity | 10 to 95% RH | 0.1% RH | ±4% RH |
| Wet Bulb Temperature | 22.2 to 120°F (–5.4 to 49.0°C) | 0.1° | Calculated |
| Dew Point | –13.5 to 120.0°F (–25.3 to 49.0°C) | 0.1° | Calculated |
| Display | Backlit LCD | — | — |
| Power Source | 3 × AAA batteries (included) | — | — |
| Dimensions | 6.0 x 2.3 x 1.0" (153 x 58 x 25 mm) | — | — |
| Weight | 5.6 oz (160 g) | — | — |
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The Extech RHT510 is a versatile handheld psychrometer that measures relative humidity, ambient air temperature, dew point, and wet bulb temperature—plus surface or air temperature via an included general-purpose Type K thermocouple probe. Designed for HVAC, industrial, and environmental applications, it features a backlit LCD for clear viewing in low-light conditions, Min/Max recording, Data Hold, and an optional tripod mount. With its ability to calculate psychrometric parameters and support high-temperature Type K measurements (up to 2372°F / 1300°C with compatible probes), the RHT510 is ideal for comfort assessments, drying operations, and thermal diagnostics.
| Air Temperature | 32 to 122°F (0 to 50°C) | 0.1° | ±2.5°F (±1.2°C) |
| Type K Temperature | –148 to 2372°F (–100 to 1300°C) | 0.1° | ±0.4% + 1.8°F (±1°C) |
| Relative Humidity | 10 to 95% RH | 0.1% RH | ±4% RH |
| Wet Bulb Temperature | 22.2 to 120°F (–5.4 to 49.0°C) | 0.1° | Calculated |
| Dew Point | –13.5 to 120.0°F (–25.3 to 49.0°C) | 0.1° | Calculated |
| Display | Backlit LCD | — | — |
| Power Source | 3 × AAA batteries (included) | — | — |
| Dimensions | 6.0 x 2.3 x 1.0" (153 x 58 x 25 mm) | — | — |
| Weight | 5.6 oz (160 g) | — | — |