The board uses tin dioxide as a sensor material, which has low conductivity in clean air. The conductivity increases as the concentration of alcohol increases. Special features • Voltage supply: 3.3 - 5 VDC • Output: Digital + analogue • Dimensions: 45 x 26 x 13 mm https://elecena.pl/product/18423570/developer-boards-gas-sensor-alcohol-ethanol-mq-3 2021-05-11 https://elecena.pl/product/18423570/developer-boards-gas-sensor-alcohol-ethanol-mq-3 2021-11-17 https://elecena.pl/product/18423570/developer-boards-gas-sensor-alcohol-ethanol-mq-3 2025-02-08 https://elecena.pl/product/18423570/developer-boards-gas-sensor-alcohol-ethanol-mq-3 2026-02-20