John Deere 20" Portable Hay Tester - SW007320. Moisture Tester - HT PRO HAY TESTER. Expanded low moisture range down to 8%. Backlit display for night use. Extra-rugged 20" probe for testing round or square bales. Direct readout for % moisture and temperature. Above and below moisture limit indication. Accurate throughout the normal test range of stored baled hay. Testing range: 8%-44% moisture. This is a OEM John Deere part. Thanks for looking!