Comprehensive DIY Alcohol Testing Circuit featuring Advanced MQ3 Technology

Portable Alcohol Testing Kit with MQ3 Sensor for Personal and Professional Use

MQ-3 Ethanol Gas Sensor Circuit Board Kit for Drunk Driving Simulation

2pcs Sensor Module For waterproof for Accurate For water Quality Testing

10pcs SW420 Vibration Sensor Modules for Theft Prevention Alarm Systems

Total Dissolved Solids Sensor for Water Measurement and Quality Testing