CJR10 / 4-type carbon dioxide, methane, measuring equipment (hereinafter referred to as detector) is my latest development and production of intelligent, multi-function, ultra-small digital methane (gas) concentration and carbon dioxide concentrations of test-tuner device, mainly for coal has gas explosion risk areas, such as the furnace shaft alley, mining face, mined-out area, back to the wind tunnel, belt roadway transportation, electrical and mechanical rooms, etc. Cave, continuous monitoring of methane and carbon dioxide concentration or the concentration of carbon dioxide overrun, the detector immediately send sound, light alarm, methane alarm every 10 seconds automatically record and store a frame of data, carbon dioxide alarm every 1 minute automatically record and store a frame of data. Detector can be fixed to use in these places, is also available for work underground cadres, ventilation management, gas inspectors, blasting a member of staff of the mining face to carry use.