John Deere Advanced Moisture Tester - SW007305. Moisture Tester - ADVANCED HAY,STRAW, & SILAGE TESTER. For Hay, Straw and Silage. Measures 8% to 72% moisture content. Continuous reading as you probe bale. Stores the last 1,000 moisture and temperature readings. This is a OEM John Deere part. Thanks for looking!