A1 Testing & Tagging - electrical safety national service. Since inception in 2003 A1 Testing and Tagging's have differentiated ourselves from the competition through our professional customer service. We Offer: - test and tag services, - test tag label sales, - PAT tester sales, - calibration services - test and tag courses - online courses. A1 Testing and Tagging is the one-stop shop when it comes to the electrical safety of your business.