G-Checker

Gas measurement is possible anywhere with only a sensor module and a smartphonetype of gas - O2 (oxygen) - CO2 (carbon dioxide) - H2S (hydrogen sulfide) - CO (carbon monoxide) - NO2 (nitrogen dioxide) - SO2 (anti-dioxide) - O3 (ozone) - HCHO (formaldehyde) - H2 (hydrogen)Gas sensor purchase link http://www.allsensing.com