A probe tester for baled hay that reads moisture and temperature live as you probe. The 51 cm (20 in) probe gets into tight bales. It reads hay moisture from 8 to 44% and is most accurate between 10 and 30%; treat readings over 30% only as a sign of very high moisture. Temperature can show in °C or °F.
Push the probe into the tight side of the bale at 45°, take readings in at least five places, and go by the highest, without averaging. Let the tip settle to the bale's temperature, which can take a minute or two. It's calibrated on alfalfa, so the more grass in the hay, the higher it reads compared with the real moisture. Readings can also run high in the first days after baling, in denser bales, and with preservatives. Use it as a guide for safe baling and storage, not an exact measurement.
It comes with a calibration clip; check calibration with it after each battery change. It needs a 9 V alkaline battery, not included. Wipe the probe tip clean between uses, never put the probe in water, and take the battery out if it won't be used for months.
