Duff
Moisture
Meter
USDA Forest Service
Rocky Mountain Research Station
Forestry Sciences Laboratory - Moscow, Idaho
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Duff Moisture Meter DMM600

The duff moisture meter provides immediate duff moisture content measurements in the field with a minimum amount of sample preparation and no additional equipment for signal analysis.

The tough, lightweight DMM600 is a portable, battery-powered meter that derives water content measurement from the frequency output of the meter's sensor circuit.
The DMM600 Duff Moisture Meter is held open showing the sample chamber and the compression plate. The output display window is shown in the inset photograph (upper left corner).
Push the duff sample through the sieve into the chamber Fill the chamber with the duff
Compress the sample using the hand-turn knob, stopping when the audible signal is sounded Read the moisture content from the display window at the base of the instrument
Using the duff moisture meter in the field is simple and fast. Toggle the power switch on and select the duff to be sampled -- usually from the lower half of the duff layer. (a) Push the duff sample through the sieve into the chamber. (b) Fill the chamber with the duff. (c) Compress the sample using the hand-turn knob, stopping when the audible signal is sounded. (d) Read the moisture content from the display window at the base of the instrument.

Patented and developed through a cooperative research effort by three USDA Forest Service entities -- Moscow Forestry Sciences Laboratory, Missoula Fire Sciences Laboratory, and Missoula Technology and Development Center -- the Forest Service collaborated with Campbell Scientific, Inc. (Logan, UT) for production and marketing of the DMM600.

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