BRAND NEW Heated Diode(Pentode) Halogen Refrigerant Leak Detector, Air Pump HVAC Tool. You are looking at a brand new, Portable Automatic Halogen refrigerant Leak Detector, with heated diode sensor, Air Pump. Model: HD2. Most Sensitive Detector in the World! beat every other detectors of this kind on the US market by competitors research. FEATURES Our Newest Design and Technology in Halogen Detection! Heated diode sensor Moisture will not cause false alarm New design with new Microprocessor controlled circuit and Advanced Digital Signal Processing Detects ALL halogenated refrigerants, CFCs, HCFCs, HFCs, and their blends(R500, R503, R22, R123, R124, , R502, R134a, R404a, R410A, R407, R125, AZ50, HP62, MP39, R403A, R12, R11, etc Audible alarm with variable frequency, and visual LED Multi-color display. Sensitivity adjustment, provides more control. On/Off switch control and reset button to any back ground halogen level. High Sensitivity: Less than 0.1 oz/year (or 3 grams/year R22) Optimized speed of Air pump provides a positive flow of sampling air. Come with a hard plastic carrying case to provide protection. AC adapter with Battery backup Batteries(4 AA, included) backup for Cordless operation. 15.5" flexible rubber lined SS wand, reach to almost any tight space. with Low battery warning.