The FieldPiece SRL8 Heated Diode Refrigerant Leak Detector. The SRL8 Heated Diode Refrigerant Leak Detector is designed exclusively to make the HVAC/R Technician's job easier, faster, safer and more efficient. We set out to develop the best heated diode leak detector for HVAC/R. We believe the SRL8 is it. It comes in kit form in a rugged, blow-mold case with all of the extras you don't get from the other guys. This package includes an Advanced Refrigerant Leak Detector (SRL8), five o-rings and 10 replacement filters (RFL2), a 9" Flex-Probe Extension (RFE2), a Blow-Molded Case (ABMK3), and an operator's manual.