The FJC Electronic Leak Detector, No. 5110, is designed to detect all CFC, HFC, HCFC, and HFO refrigerants, including R-134a and R-1234yf. It features automatic calibration, a mechanical pump, three sensitivity levels, and a low-battery indicator. Includes four AA batteries. Compliant with SAE J2791, SAE J1627, and EN14624 standards.