How to Calibrate Hay Moisture Meters

Moisture levels are a concern to farmers who bale and sell hay for livestock. In addition to being a fiber source for animals, hay also contains healthy nutrients which contribute to optimal health. Timing is crucial when cutting and baling, since moisture content is central to retaining nutrients, but also complicit in the spoilage of baled hay. Furthermore, desirable moisture levels vary in the type of hay in question. A quick and easy reading is obtained from a moisture meter. Whether hand-held or tractor-mounted, this device senses moisture presence with metallic probes, which transmit their readings to a digital display. Regular calibration of this instrument is advisable, as the content standard changes and the probes are affected by debris and excessive use.

Instructions

- 1
  Select a standard against which you will measure your readings. For example, some grasses will be best for baling between 24 and 30 percent moisture. In this instance you may choose 26 or 27 percent as your standard for calibration. Some models will default to a pre-set figure, in which case you must change the set point.
- 2
  Run a calibration test on the instrument. There may be a single button for this task or you may be required to press several, either in sequence or simultaneously. Your owner's manual will guide you in this procedure.
- 3
  Power off the meter and clean the probes if the display is giving illogically high or low moisture readings. It may be reading the moisture content of foreign debris. Excessive humidity will also affect calibration. Perform this task in a climate controlled environment.
- 4
  Turn the meter back on and confirm that the set point has not changed. Repeat the calibration test.

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