AgraTronix BHT-2 [07160] Baler-Mounted Hay Moisture Meter, 8% - 30%. AgraTronix BHT-2 Advanced Baler-Mounted Hay Moisture Tester has advanced multi-sensor technology for greater overall accuracy while baling hay with small square or round hay balers. The sturdy display module mounts in the tractor cab and displays readings from upgraded sensor pads mounted in the baler chamber. Moisture reading averages are updated and displayed every three second. Baling your hay at the correct moisture levels saves time and money.