Feature:1. [High Precise Sensor] The detector utilizes an imported gas sensitive semiconductor sensor, ensuring high precise and more accurate measurements.2. [High Performance] Our gas test meter features rapid response time, low power consumption, excellent stability, and a long lifespan, giving you a reliable testing tool.3. [Multiple Alarm] The gas tester provides real time feedback on gas leakage. When gas concentration exceeds the alarm level, the instrument will emit an audible and visual alarm.4. [Portable and Versatile] Powered by 3 AAA batteries (not included), this portable halogen meter can be carried anywhere and used both outdoors and indoors.5. [Wide Application] This halogen gas tester is suitable for various domestic and industrial applications, ensuring your safety in different occasion by efficiently detecting gas leakages.Specification:Item Type: Halogen Gas TesterMaterial: ABSBattery: 3 x AAA Batteries (Not Included)Detection Range: 0-5000PPM, 0-200ppm (20ppm), 200-2000ppm (10%), 2000-5000ppm (20%)Sensitivity: 1PPMPreheating Time: 5sAlarm Mode: Visual, Audible.Package List:1 x Halogen Gas Tester1 x Storage Bag1 x User Manual