The KGS 102 is an SnO2 semiconductor gas sensor and is used in gas detection, air cleaning system, auto-ventilation system, micro wave oven, etc. In a clean atmosphere, the resistance of the sensor is high. However, with the increase of water vapor or gas concentration in the atmosphere, the resistance decreases. The KGS 102 gas sensor features high stability against air flow, superb response time and excellent durability.