This moisture meter measures the moisture content of hay and straw directly inside a baled bale. The 450 mm probe is inserted into the bale to take a reading from the core, where moisture is most representative of the overall bale condition. The instrument provides a reading within a working range that covers typical hay moisture levels. A reading taken at the surface can be misleading, as the outer layer dries faster than the interior; using the probe depth ensures the measurement reflects the bale's true storage risk. The meter is a handheld accessory, not a permanently installed sensor, and is used during baling or at storage check intervals.