Features the first and only portable hay moisture tester to include a calibration clip 20 inch probe length Above and below moisture limit indication Backlit LED display for low light operation Specifications Moisture range: 8% to 45% depending on hay tested Temperature range: 32° to 225°F (0° to 107°C) Accurate throughout the normal range of stored, baled alfalfa, timothy and clover hay Display resolution: 0.1% moisture 9V battery required