?The KT-H2S-100-TB200A Sensor Modules ROHS manufactured by AIRWAT is a fully-integrated electronic component that is used to measure hydrogen sulfide (H2S) levels from 0 to 100ppm (Parts Per Million). This type of component features a built-in amplifier, an analog-to-digital converter, and a thermistor module to ensure accuracy and reliability. This H2S sensor is designed with automatic self-calibration and is composed of a carbon monoxide (CO) detecting element, an H2S detecting element, a temperature detecting element, and a humidity detecting element. It is RoHS compliant and provides a wide operational temperature range from -40°C to 70°C in order to ensure user safety. Furthermore, this H2S sensor is also corrosion-resistant, making it ideal for both indoor and outdoor environments.