The meter is also helpful in documenting water weight to ensure transactions reflect fair market value. This Moisture Meter provides percent moisture content (%MC) in seconds, so you can make the decision to wait or to go ahead with harvesting or ginning in the field. Resistance technology measures moisture in cotton, viscose rayon, and wool. Stores up to 100 readings and calculates the average for your convenience. Audible alarm warns you when the moisture content is higher than the set point.