Professional Portable AC Refrigerant Leak Halogen Gas Leakage Detector for Home Contractor Repairmen Excellent high sensitivity sensor, 6g/yr (0.2oz/yr) Detects All KINDS OF halogenated refrigerants Flexible stainless steel probe reach to almost any tight space Dual-color LED indicator light, Starts detection once powered on Adjusts automatically to the best state of detecting, no manual-adjustment needed