4-IN-1 Air Velocity/Humidity/Light/Temperature Meter

The HHF81 anemometer can measure air flow, humidity, temperature and light. The built-in microprocessor circuit assures excellent performance and accuracy. The HHF81 can track the maximum and minimum values along with current readings. The HHF81 displays the flowrate in your choice of knots, meters per second, kilometers per hour, miles per hour, or feet per minute.

The HHF81 relies upon a low-friction ball bearing mounted wheel design to provide high accuracy at high and low air velocity. The impeller provides excellent accuracy (±3 to 4%) and the ability to measure the slightest breeze (0.3 m/s). For temperature readings, the HHF81 has an internal thermistor or is compatible with any Type K thermocouple with SMP Male connector, and is accurate to ±1°C + 1% of reading. The humidity sensor measures to 95% relative using a high precision thin-film capacitance sensor with fast response to humidity changes. The Light measurement utilizes an exclusive photo diode and color correction filter light sensor.

SPECIFICATIONS
AIR VELOCITY
Measurement Range: 80 to 5910 ft/min, 0.4 to 30.0 m/s, 0.9 to 67.0 mph, 1.4 to 108.0 km/hr, 0.8 to 58.3 knots, 0.8 to 58.3 knots
Resolution: 1 ft/min, 0.1 m/s, 0.1 mph, 0.1 km/hr, 0.1 knots
Accuracy:
   ≤20 m/s: 3% FS
   >20 m/s: 4% FS
TEMPERATURE (Internal Thermistor)
Measurement Range: 0 to 50°C (32 to 122°F)
Resolution: 0.1°C/°F
Accuracy: ±1.2°C (±2.5°F)
Operational Temperature: 0 to 50°C (32 to 122°F)
TEMPERATURE (External Type K Thermocouple)
Measurement Range: -100 to 1300°C (-148 to 2372°F)
Resolution: 0.1°F/°C
Accuracy: ±(1% + 1°C) of rdg [±(1% + 2°F) of rdg]
HUMIDITY
Measurement Range: 10 to 95%
Resolution: 0.1%
Accuracy:
   <70% RH: ±4% of rdg
   ≥70% RH: ±(4% rdg + 1.2 % RH)
Operational Humidity Max.: 80% RH
LIGHT LUX
Measurement Range: 0 to 2200 Lux, 1800 to 20000 Lux, 0 to 204.0 Fc, 170 to 2000 Fc
Resolution: 1 Lux, 10 Lux, 0.1 Ft-cd, 1 Ft-cd
Accuracy: ±(5% rdg +8 dgt)
Overange Display: “----”
Battery: 9V (included)
Power Consumption: Approx. DC 6.2 mA
Weight: 160 g (0.4 lb) battery included
Dimensions: 156 x 60 x 33 mm (6.14 x 2.36 x 1.29')