The RH401 is a Digital Psychrometer with a Built-in IR thermometer that allows quick non-contact surface temperature measurements. Displays air temperature, humidity and surface temperature or dew point, humidity and surface temperature or wet bulb, humidity and surface temperature on a triple LCD with backlighting. The IR thermometer features adjustable emissivity and a spot/distance ratio of 8:1. The meter calculates the temperature difference between IR surface temperature and dew point. Ideal for spotting potential areas with mold. Other features include data hold, programmable auto power off and a retractable probe that protects the sensors when the meter is not in use. Includes hard case and four AAA batteries.
| Humidity | 10 to 90%RH | 0.1% RH | ±3% RH |
| Temperature (internal) | -4 to 122°F (-20 to 50°C) | 0.1° | ±1.8°F or ±1°C |
| Temperature (external) | -328 to 2498°F (-200 to 1370°C) | 0.1° | ±0.3% or ±1.8°F/±1°C |
| Dew Point | -90.4 to 122°F (-68.0 to 49.9°C) | ||
| Wet Bulb | -6.9 to 122°F (-21.6 to 49.9°C) | ||
| Dimensions | 9 x 2.2 x 1.7" (230 x 57 x 44mm) | ||
| Weight | 5.3oz (153g) | ||
