Regin Thermocouple Tester – REGT20 The Regin REGT20 Thermocouple Tester is a small but essential diagnostic tool to test gas thermocouples quickly and accurately. For heating engineers and gas professionals this tool ensures gas valve reliability and system safety. Using the REGT20 is easy — just assemble the thermocouple into the tester, heat the tip and press the white button. If the thermocouple is working correctly the plunger will stay down for approximately 20–30 seconds simulating the holding action of a gas valve. Perfect for on-site servicing, maintenance and fault diagnosis the Regin Thermocouple Tester gives engineers a quick and reliable way to confirm thermocouple operation before replacement. Key Features & Benefits Quick Function Test