Features: 100% brand new and high quality There are 2 types, CGD01 and CGD02, CGD02 is adjustable and with sound shock alarm, CGD01 can not adjust and with sound alarm. Compact size, light weight, easy to carry and operate. Long flexible stainless probe reaches all areas. Detect leaks of natural gas, propane, methane, butane, LP, LNG, LPG, fuel, gasoline, sewer gas, coal gas, alcohol, toluene, industrial solvents and other flammable gases. Alarm mode:audible(CGD01),audibel+vibration prompt(CGD02) Made of high quality ABS plastic, durable and long time service. Package Includes: 1x Combustible Gas Sensor Specifications: Material: ABS Body Size: 180x70x30mm/ 7.08x2.75x1.18 in Probe Length: 30 cm/ 12 in Product type:leak detection type(CGD01),digital display concentration(CGD02) Sensitivity:adjustable(CGD02 can not) Preheat time:less than 30 seconds Alarm mode:audible(CGD01),audibel+vibration prompt(CGD02) Sampling method:diffusion type Operating hours:more than 1 hour Function only CGD02: Display:LCD Display Measuring range:0~100%LEL Tolerance scope:+-5% Resolution:1%LEL Alarm value setting:high and low two points freely set Concentration alarm value:adjustable Temperature range:-10~50C Temperature error:+-1.5C note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.