Abstract: Various aspects include a pressure testing device for testing a plumbing installation, along with related methods. In some cases, a device includes: a pressure testing line for coupling with the plumbing installation; a pressure sensor fluidly connected with the pressure testing line; a tamper-resistant memory; and a control system coupled with the pressure sensor and the tamper-resistant memory. In various embodiments, the control system is configured to control the pressure test of the plumbing installation based upon a threshold pressure for that particular test, and store a test record of the pressure test in a tamper-resistant memory upon completion of the pressure test.