Testo 557S vacuum decay test using the Bluetooth Testo 552i. Why U don’t use refrigerant hoses

1: You do not use rubber refrigerant hoses to perform a vacuum decay test. The results shown is the reason why. 2: You do not use a refrigerant manifold because they were actually not designed to perform deep vacuum decay test. 2. Unless under special controlled certain circumstances and you were using all metal lines in replace of hoses with no rubber gaskets. Only then would you have a chance at performing a decent vacuum decay test for a short duration of time.