A variety of directives describe the tests which have to be carried out before commissioning water and gas pipes. The testo 312-4 differential pressure measuring instrument offers measuring processes for load and tightness tests as well as serviceability tests on gas pipes using air. It also enables the checking of static gas and gas flow pressures, as well as the nozzle pressure setting on gas burners or boilers. These measurements are possible with the testo 312-4 differential pressure measuring instrument Tightness and serviceability testing by pressure drop on gas pipes in accordance with DVGW TRGI 2008 Load testing on gas pipes in accordance with DVGW-TRGI 2008 using our high-pressure probe (can be ordered as an option) Pressure testing on drinking water pipes using water and with the support of the optional high-pressure probe in accordance with DIN 1988 (TRWI) and using air in accordance with the ZVSHK information sheet Pressure testing on waste water pipes using our high-pressure probe (can be ordered as an option) Checking the gas pressure regulator by recording the readings over a defined period (max. 25,000 readings) Checking the gas connection and gas flow pressure, as well as setting the nozzle pressure on gas burners and boilers