The moisture meter can quickly measure the moisture content of the grain. 1. ENERGY SAVING: This fireplace fan is run with heat energy, does not require batteries, greatly saves energy and 16% of costs, and reduces emissions caused by fuel loss, is more environmentally friendly. 2. AUTO START: The fireplace fan will start automatically when the surface temperature of the furnace body reaches about 122 . No assembly required, can be used directly. 3. HEAT MAINTENANCE: When the furnace temperature is low, the fireplace fan will have more airflow and higher speed to keep the room warm. 4. QUIET AND STABLE: The blades are well made and the spiral runs quietly, the body is resistant to high temperatures for long-lasting stability. 5. WIDE APPLICATION: The fan is suitable for those who are off-grid or want to improve furnace performance and consume less fuel. It can be used for wood, gas and pellet fired stove. Specification: Item Type: Heat Powered Fan Material: Aluminum Alloy Black color Fan Blade: 6 Operating temperature: 80 to 350 Air Volume: 180-220CFM Wind speed: 1400 rpm Display Built-in Noise: 25 dB Weight: ok. 559 g/19,7 oz List of packages: 1 x Heat Powered Fan 1 x English Manual