The moisture meter can quickly measure the moisture content of the grain. 1. Manual generator crank, nice helper in emergency circumstances. 2. Energy saving, environmental friendliness and many types of interfaces. 3. 4. Metal outer housing more durable, non-slip foot pad more stable, old bearing, easy and time saving. 5. Compact size, convenient to assemble, easy to carry, not with internal energy storage function. 6. Practical, suitable for field use, field operations, field trips, relief operations, natural disasters, survival training, emergency communication, long-term power outage, tourism, etc. Specification: Item Type: Generator Hand Crank Model: F20 Material: metal Colour blue Maximum power: 20 W Rotation speed: 2000 rpm Display Built-in Voltage/current: 3 V/6,6 a, 5 V/4 a, 6 V/3,3 a, 9 V/2,2 a, 12 V/1,6 a, 15 V/1,3 a Output voltage: up to 28 V Weight: ok. 800g List of packages: 1 x Generator hand crank 1 x Rocker Note: 1. The faster the rocking power, the higher the generation power and voltage.2. Shake the output voltage of the generator must be greater than the setting voltage to adjust the output voltage.3. Before using the USB interface, adjust the voltage to 5 V. 4. It can directly charge lithium battery, nickel-metal hydride battery, lead-acid battery and other types of batteries.