Testo 316-3 Refrigerant Leak DetectorAdvanced Refrigerant Leak Detector for Swift Identification of Refrigerant Gas Leak The Testo 316 3 Refrigerant Leak Detector is a portable device designed to detect leaks in refrigeration systems. It uses a heated diode sensor to detect refrigerant gases, including R22, R134a, R404A, R410A, R507, and others. The Testo 316 3 has a sensitivity range of 0. 15 oz yr (4 g a) to 0. 02 oz yr (0. 6 g a), detecting even small leaks. It also features an