The HygroSet® FM has the same great adjustment features as the HygroSet® I and II but is made specifically for exterior front mount humidors. The HygroSet® FM is capable of being adjusted after calibration. Each click of the adjustment knob changes the humidity display (+ / -) by 1%.

Features:

  • Easy-set calibration Instructions.
  • Humidity accuracy +/- 2% from 20% to 90%
  • Temperature accuracy +/- 1 degree (displayed in Celsius or Fahrenheit)
  • 10 Second refresh rate
  • Button cell battery included