Compact Structure & Super Light Weight: Portable to use and store, providing you with a better user experience. High Precision & Fast Response: Adopts gas-sensitive semiconductor sensor for fast detection and has a wide reaction range (50~1000ppm). 6.6-inch Long Probe: The long probe allows you to freely detect in narrow places. Visible & Audible Dual-way Alarm: When combustible gas leakage is detected, the buzzer will sound and the concentration indicator will light up. Low Power Consumption: Powered by 2 AAA batteries (NOT included), with low battery indication, long standby time, and easy replacement. Auto Power Off: When no concentration is measured within 5 minutes, the meter will automatically shut down. One button to power on-off manually. Specifications: Sensor: Gas-sensitive semiconductor Reaction Range: 50~1000PPM (methane) Reaction Sensitivity: Less than 50ppm (methane) Warm-up Time: 30s Reaction Time: 500ppm: 5s, 500ppm: 2s Alarm Mode: Visible and audible Operating Condition: 0~50°C, 20~80%RH Storage Condition: -10~60°C, 20~80%RH Power Supply: 2 * AAA battery (NOT included) Material: Plastic Color: Black Package Contents: 1 x Gas Leak 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 to appear slightly different from the real thing. The measurement allowed error is +/- 1-3cm.