The Pet Pile Integrity uses the Pulse-Echo method (PEM) for a quick pile integrity test (quality control) on a site with a large number of piles. A pile test starts when the pile top is struck with a lightweight handheld hammer. It is a widely used non-destructive test method for the evaluation of pile quality, and integrity. The test can also be used to estimate the unknown length of existing piles and foundations. Pet Pile Integrity is made in various specifications.