Features: Intellectualized design, with recording function, can record up to 99 sets of data. Chameleon background lighting, white, green and red, react three different measurement condition. Acoustic-optic alarming, easy to set. Ergonomically body designed, beautiful outlook, nice operate feeling and easy to carry. Measured gas type: natural gas, liquefied petroleum gas, coal gas and other combustible gas, as well as organic solvent volatilization gas of gasoline, alcohol, ketene, etc. Specification: Model: SPD202/Ex Measuring Range: 0-100%LEL, 50-50000ppm Resolution: 0.1 %LEL, 10ppm Measurement Error: ≤5% Test Result Read Time: 10 seconds Battery: 4 x 1.5V AA battery (NOT included) Detector Body Size: Approx. 16.5*7.3*4cm/6.5*2.9*1.6inch Total Length: Approx. 52cm/20.5inch Weight: Approx. 675g / 23.8oz Measurement ConditionBacklightNormalWhite＞ALA1Green＞ALA2Red Applications: Gas leakage detecting of city gas. Combustible gas leakage detecting of petrochemical industry. Combustible gas leakage detecting of Shipbuilding industry. Combustible gas leakage detecting of Depot, gas station. Combustible gas leakage detecting of oil tank truck. Combustible gas leakage detecting of fire & rescue industry. Package List: 1 * Combustible Gas Detector 1 * Plastic Case 1 * User Manual