Soapy water Inficon TEKMate 705202G1 Refrigerant Leak Detector, R22, R410A, R134A DetectsEZJECT™ COMPLETEFLUORESCENT LEAK DETECTION KITSPEHVLEZEBacharach H10 PRO UltraSensitive Universal Refrigerant Leak DetectorModel: H10 PROMALine MA600CFA Digital ClampOn Meter with Temperature Measuring Feature