UV Leak Detector: This system is designed to provide the technician with an accurate diagnostic tool used to detect leaks in A/C units and refrigeration systems. Find leaks fast when you add a small amount of fluorescent dye to the A/C and refrigeration system. The universal dye is compatible with all refrigerants and oils used in these systems. The dye is injected into the AC&R system while under pressure. The dye circulates with the refrigerant's oil and escapes from the system at all leakage points.