The WINSEN ZE12-SO2 is an electronic sensor designed for the detection of sulfur dioxide (SO2) concentrations from 0 to 2 parts per million (ppm). It has a small form factor, low power consumption, and excellent accuracy. The sensor utilizes a tungsten trioxide (WO3) semiconductor, metal oxide semiconductor field effect transistor (MOSFET), and thermopile for heat compensation to achieve high accuracy. The sensor is also resistant to interference from other gases and has a wide detecting range. Additionally, it can be used in both indoor and outdoor environments.