In a pressure decay test, also known as a vacuum decay test, a pressure vessel is filled with air until a target pressure is reached. Then the loss (decay) of that pressure is measured over a set period of time. On the other hand, there are several types of vacuum leak testing. For example, specialized devices such as our TAPIR leak detector can conduct two types of tests utilizing either tracer gas helium or hydrogen for detection. Vacuum leak testing offers quicker results compared to pressure decay testing and is also less sensitive to external factors such as temperature variations. Thus, the results are also more accurate.