This gas leakage detector is used to detect halogen gas with high sensitivity. It can detect leakage in air-conditioning, freezing systems, etc. Features: Hand-held design for easy operation. Can detect all kinds of halogen refrigerant gas. Equipped with long flexible stainless probe for all application.  LED display to show the relative leak size. With adjustable sensitivity and fast warm-up. Audio & visible leakage alarm indication and low battery indication. Compact size and light weight, easy to carry. Specifications: Brand Name: SMART SENSOR      Color: Black Material: ABS  Detection Gas: All Refrigerant Gas Sensitivity: Less than 0.5oz/yr Alarm Mode: sound alarm and light alarm                         Response Time: Instantaneous  Warm-Up Time: less than 20 Seconds       Continuous Operation Time: 9 hours(slightly vary with working condition) Power Supply: 3 * 1.5V AA Alkaline Batteries(NOT Included) Operating Temperature: 0～50℃ / 32～122℉ Storage Temperature: -10～60℃ / 14～140℉ Item Size: Approx. 15.8 * 6.3 * 3cm / 6.2 * 2.5 * 1.2in  Item Weight: Approx. 173g / 6.1oz Package Size: Approx. 23.1 * 14 * 3cm / 9.1 * 5.5 * 1.2in  Package Weight: Approx. 209g / 7.4oz Package List: 1 * Halogen Gas Detector 1 * User Manual(English)