The owner of GaugeTec and I have been teaching together for over fifteen years. Together we have helped certify over a thousand Wisconsin,Minnesota,Iowa and Illinois backflow testers. As a Cross Connection Control and Plumbing Code Instructor I would highly recommend GaugeTec to any of my students for their annual test gauge calibration needs. You will find that GaugeTec is very professional and always puts the customer first. Rest assured that your test gauge will be in good hands and returned to you promptly and in great shape.