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The DAFM4 is the tool for all your airflow measurement needs. With the DAFM4 you can directly capture air temperature, relative humidity, and air velocity. It also calculates wet-bulb temperature, dew point temperature, and air volume. Enter duct dimensions for live or timed average of air-flow in CFM (or CMM), or use the effective area of a grill for outlet volume measurements.

Air volume is displayed in real-time, or choose a timed average with start/stop capabilities to traverse ductwork.

  • 0.7” diameter vane head with 39" long telescopic & scale marked probe
  • Mini vane probe with built-in temperature & RH sensor
  • Up to 1 hour accumulative average
  • Metric & imperial scales
  • Handheld size, easy to carry
  • In-duct or grill surface measurements
  • Low battery indication
  • Fast, accurate response
  • Display Max/Min value
  • Hold function freezes current readings
  • Sleep and non-sleep selectable
  • Powered by 9V batteries or 9V DC adaptor

  • Measures: Air velocity, temperature, RH%
  • Calculates: Air volume, web bulb, dew point

  • 0.7” small diameter air vane on 39" long telescoping probe
  • Hard carrying case
  • 9V battery
  • Manual
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Product Type:

Humidity & Air Flow Tester


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