AgraTronix Corn Stove [08150] Portable Coffee Moisture Tester. AgraTronix Portable Coffee Tester is calibrated to provide precise moisture results for parchment and green coffee. It is a portable moisture testing equipment that can be operated anywhere and at any time. The coffee humidity meter has a back lit, multilingual display that provides accurate readings. It can work in either basic mode or advanced precision calibration mode to match the local elevator. The portable coffee moisture tester can be used with multiple sets of grain scales. It operates well in moisture range: 7% to 40% for green coffee, 8% to 40% for parchment coffee and 4% to 20% cocoa. It provides accurate readings in normal moisture range for the stored grains.