The moisture meter can quickly measure the moisture content of the grain. 1. External connection adopts rotary crimping clamp to make the connection more stable; 2. Equipped with fixed mounting holes for easy installation, useful and practical, very convenient; 3. The relay has a long service life and can be permanently closed 100 000 times, which is durable; 4. Suitable for 10A 250VAC, 10A 30VDC load control, helps a lot in everyday life! 5. It plays the role of automatic regulation, safety protection, conversion circuit, etc. In the circuit; Specification: Item Type: High Level Relay Controller Module Material: PCB Input Voltage: DC 3 V/3,3 V Suitable scenarios: used for 10A 250VAC, 10A 30VDC load control Purpose: plays the role of automatic regulation, safety protection, conversion circuit, etc. in the circuit; List of packages: 1 x High Level Relay Controller Module Power interface: VCC: Connect the positive pole of the power supply (3.3V) GND: Connect to the negative pole of the power supply IN: High level control relay pulls in Load interface: NO: Relay normally open interface, the relay is hung up before power on, closed and shorted to COM after Closing COM: Relay common interface NC: Relay normally closed interface, shorted to COM before relay closes and suspended in air after closure