Met-L-Chek is an approved manufacturer, qualification laboratory, and supplier of liquid penetrant inspection materials under ... SAE QPL AMS 2644 by the United States Air Force Research Laboratory’s Materials and Manufacturing Directorate at Wright Paterson Air Force Base. We are a provider of certified magnetic particle inspection materials and UV-A LED inspection lights. Our liquid penetrant and magnetic particle materials are certified to meet the requirements of AMS, ASTM, ASME, ISO, DoD specifications and trusted by Pratt & Whitney, General Electric, Rolls-Royce, Boeing, Consolidated Precision Products, Mistras, and Precision Castparts Corp. read more