Feature 1Flexible Operation: Powered by 2pcs AAA battery, the probe of this halogen gas detector supports flexible bending to work in narrow pipeline. 2Better Application: The refrigerant gas detector can test the leakage position on air conditioning pipe, ideal for home and industrial use. 3With High Accuracy: Comes with semiconductor sensor, the freon leak detector with simple test circuit ensures quick response and high accuracy. 4Sound Light Alarms: The sound alarm and indicator light will largely facilitate the real time warning, thus simplifying repair and maintenance. 5Convenient Carrying: Light in weight and compact in size as well, the halogen gas tester is very convenient to carry with your for working.Item Type: Halogen Gas DetectorResponse Range: Approximately 50PPM~1000PPM. Sensitivity: > 50PPMPreheating Time: About 35s. Response Time: 500PPM, approximately 5s. > 500PPM, approximately 2 seconds. Alarm Method: Sound and indicator light. Battery: 2 x 800mAh AAA alkaline dry battery, shipped with matching battery. Package List: 1 x Halogen Gas Detector2 x Battery