• Temperature: -4 to 140˚F (-20 to 60˚C) / Accuracy: ±1˚F (±0.6˚C)
• Relative Humidity: 0 to 100% RH / Accuracy: ±3% at 10 to 90% RH (cal. temp.) ±5% at other range
• Dew Point: -90 to 158˚F (-68 to 70˚C)
• Wet Bulb Temperature: -7.6 to 158˚F (-22 to 70˚C)
• Air Velocity: 0.3 to 35 m/s (1 to 114 ft/s)
• Air Volume: 0 to 99999 m3/s (0 to 99999 cfm)

The Mastercool Airflow + Psychrometer is a battery-operated, micro processor-based meter that reads humidity, air temp., dew point, wet bulb, air velocity, air volume and BTU. The sensor is built into the remote fan and is protected by a rotating cap. With auto-off with disabling, fast and accurate reading, tripod mountable, microprocessor circuitry, metric and inch units selection, large backlit LCD display, professional remote vane, all in a handheld size unit. Operates on 4 AAA batteries and has a low battery indicator.