Features: The gas leak tester features adjustable sensitivity (0-1000ppm) and responsive semiconductor sensors to halogen leaks in HVAC systems, automotive AC units, and industrial cooling equipment. Equipped with a flexible probes, alarms, and multiple gas compatibility, this detector ensures precise identification of CFCs/HCFCs leaks in confined space. For HVAC technicians, automotive engineers, and refrigeration specialists requiring reliable diagnostics during maintenance or repair operations. Ideal for detecting leaks in commercial air conditioning systems, vehicle cooling component, and industrial refrigeration pipelines. Its ergonomic plastic housing with LED light probes tip enables extended comfortable operation during detailed inspections of hard to reach mechanical assemblies. Specifications: Material: Plastic Ranges: 0~1000PPM Resolution: 1PPM Response time: >10 second Models: ZL77A (2xAAA battery requires, NOT include) / ZL77B (rechargeable) / GL77A (2xAAA battery requires, NOT include) / GL77B (rechargeable) Package Includes: 1 Set gas leak tester note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.