Portable carbon monoxide gas detector with compact size and light weight is easy to carry. transport and to utilize. It can widely used in petroleum, chemical, coal, metallurgy, paper, fire, municipal, telecommunications, food, textile and other industries. features: portable carbon gas detection detector here. can continuously monitor the concentration of CO gas in surrounding environment. Sound and light alarm operates when CO gas concentration reaches alarm level. Powered by 3 batteries (not included). Compact size, light weight, easy to carry. transport and to use. Specifications: sensor:< /strong> electrochemical principle gas detection: carbon monoxide CO unit; measurement: PPM range: 0-1000 ppm resolution: 1ppm Alarm: Sound & Light Alarm Alarm Point: low: 35ppm; Medium: 70ppm; high: 200ppm operating temperature: 0-50 ° C humidity Operating Range: 15% - 90% RH (non-condensing) Power Supply: 3 * 1.5V AAA Batteries(not included) item size: 11.5 * 6 * 2.5 cm / 4.53 * 2.36 * 0 .98