Features:  * Can be used to detect leak (even tiny leak) of all combustible gases such as LNG, LPG, methane, butane, biogas, etc.   * 16" slim Gooseneck probe, makes it easy to measure the hand-reached narrow areas with quick location of leakage source.  * Ultra-sensitive sensor, features excellent sensitivity and repeatability, effectively avoiding interference from other gases.  * It will quickly offer visible and audible alarm when the measurement index exceeds the normal range, accurate and reliable.   * Enjoy one-hand operation with thumb-controlled tick-adjustable knob. Tick will accelerate when sensor tip approaches leak.   * Ergonomic design brings comfortable handheld experience. High quality material is sturdy and durable for long-term use.  * Equipped with an earphone jack, meets different working needs. Come with a portable storage bag for more convenient storage.   * Can be widely used in household, gas equipping and transportation, environmental monitoring, experimental applications and so on.    Specifications:  Model: GD-3300  Material: ABS+Electronic Component  Color: Gray   Probe Length: 16in  Measuring Range: 0~100%  Sensor Type: Solid State  Warm-up Time: Approx.1min  Sensitivity: 50ppm (based on methane)  Response Time: Less than 2s (up to 40% LEL)  Duty Cycle: Intermittent  Alarm Limit: 10% LEL for Methane   Battery: 3×1.5V C/R14 Batteries (NOT included)  Item Size: 221 * 72 * 46mm / 8.7 * 2.83 * 1.81in  Item Weight: 272g / 9.59oz (without battery)  Package Size: 12.4 * 26.9 * 6.9cm / 4.88 * 10.59 * 2.72in  Package Weight: 620g / 21.87oz    Note:  * Please read the user manual carefully before using this product.  * There may be slight errors due to manual measurement.    Package List:  1 * Gas Leak Detector   1 * Storage Bag  1 * User Manual