The MQ-136 is a Hydrogen Sulfide detection sensor with a sensing range of 1 - 200ppm. The sensing element is SnO2, which has lower conductivity in clean air. When H₂S gas is present, the sensor’s conductivity increases with gas concentration. A simple circuit makes measuring this change in conductivity and turning it into data fairly straightforward, but it does require some calibration. For easy Solderability, use our Gas Sensor Breakout Board. https://elecena.pl/product/17194928/hydrogen-sulfide-gas-sensor-mq-136 2020-09-25 https://elecena.pl/product/17194928/hydrogen-sulfide-gas-sensor-mq-136 2022-02-21 https://elecena.pl/product/17194928/hydrogen-sulfide-gas-sensor-mq-136 2022-10-27 https://elecena.pl/product/17194928/hydrogen-sulfide-gas-sensor-mq-136 2023-11-27