The Humimeter MCT-HS-PRO Hay and Straw Moisture Meter, USB Output, 8% to 60% is ideal for measurement of water content in hay and straw bales with fixed 0.6 meter (23.6 inch) stabbing probe. Includes temperature compensation for highest possible accuracy. Supplied with two separate built-in calibrations; one for Hay and the 2nd for Straw (also used for Miscanthus).