Accuracy level of this Fuel Efficiency Gas Analyzer is +/-2%. Sensor of this product works on the principle of electrochemistry. Its operating temperature ranges between -20 degree C to 50 degree C and its maximum operation humidity is 90% RH.This Fuel Efficiency Gas Analyzer consists of high resolution CD display screen, warning signal for vibration and sound, adjustable parameters etc. This system is capable of detecting multiple gases at the same time. This premium grade machine has long working life.