model: - probe gas : Natural gas, petroleum gas and other combustible gases Alarm value, correction:Two points field correction working voltage : DC(4.5V) 3 AAA alkaline dry cells performance period: About 5 hours range : 0~100% resolution ratio: 1% intrinsic error : 5% preheating time: 30s response time : 10s recovery time: 30s sample mode : Diffuse type display: LCD with backlight lighting direct reading: Real-time concentration reading of the sensor, battery level Alarm setting: Set the low report function and the high report function alarm: Sound, backlight LED color switch, vibration indication and alarm Operating voltage: undervoltage indication Audio tips: Higher beep frequency indicates a higher concentration explosion-proof: sign Exib IIB T3 Gb Applicable temperature range:-10-50 Suitable humidity range: Less than 95%RH(No condensation) size: 130x69x27mm(The length of the universal shaping tube is about 250mm) weight: About 222g Material: plastic colour: black Package Contents: 1 x Combustible Gas Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.