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The DAFM4 Anemometer/Psychrometer is designed with 6 HVAC/R parameters in one instrument. These are included in a portable, batteryoperated instrument for measuring humidity, air temperature, dew point, wet bulb, air velocity and air volume. The small vane probe includes sensors for velocity, temperature and humidity all on a telescoping extension, making in-duct and surface measurements possible.
| FUNCTION | ENGLISH | METRIC |
| Air Velocity Range | 99 ~ 3937 ft / min | 0.5 ~ 20 m / s |
| Air Velocity Resolution | 0.1 ft / min | 0.1 m / s |
| Air Velocity Accuracy | ±(3% or reading + 39 ft / min) | ±(3% or reading + 0.2 m / s) |
| Temperature Range | -4 ~ 140°F | -20 ~ 60°C |
| Temperature Resolution | 0.1°F | 0.1°C |
| Temperature Accuracy | ±1.1°F(-4 ~ 122°F); ±2.2°F at others | ±0.6°C(-20 ~ 50°C); ±1.2°C at others |
| RH% Range | 0.1 ~ 99.9% RH | |
| RH% Resolution | 0.1% RH | |
| RH% Accuracy | ±3% RH at 77°F(25°C) and 10~90%RH; ±5% at others | |
| Wet bulb range | -4 ~ 158°F | -20 ~ 70°C |
| Wet bulb resolution | 0.1°F (°C) | |
| Air volume display | 0 ~ 99999 CFM (m3/s) | |
| Air volume resolution | 0.1 (0 ~ 9999.9), 1 (10000 ~ 99999) | |
| LCD Size (H x W) | 1.38 x 2.13 inches | 35 x 54 mm |
| Operating temperature range | 32 ~ 122°F | 0 ~ 50°C |
| Operating RH% | Less than 80% (handset) | |
| Storage temperature range | -4 ~ 122°F | -20 ~ 50°C |
| Storage RH% | Less than 90% | |
| Dimension | 7.1 x 2.9 x .5 inches | 180 x 73 x 18 mm |
| Weight | .37 lbs | 170g |
| Battery | 9V battery (1) | |