Senko. 

Senko Co., Ltd engages in the research, development, production, and sale of electrochemical gas sensors and related devices in South Korea and internationally. The company's gas sensors include electrochemical gas sensors for detecting for detecting carbon monoxide, oxygen, hydrogen, hydrogen sulfide, ammonia, nitrogen dioxide, chlorine, ethylene oxide, phosphine, nitric oxide, vinyl chloride, and other chemicals; alcohol sensors; formaldehyde sensors to detect the formaldehyde in indoor air application; and dust sensors for detecting the concentration of dust particles in the air. It also offers portable and fixed gas detectors for preventing gas accidents in industrial field; odor and dust detectors and monitoring systems; and Big Data monitoring system, which provides performance analysis of IoT-based sensors. In addition, the company provides indoor air quality measuring instruments under the Breeze brand name; portable breathalyzers under the Blow brand name; and home CO gas detectors, as well as offers gas sensor modules. It offers its products in the fields, including gas and oil, energy, semiconductor, laboratory, general safety, and sensing IoT. The company was founded in 2004 and is based in Osan-si, South Korea.