The Linechek series of automated line-leakage testers has been approved and listed by TUV, making them internationally recognized for product-safety testing. Models 520L and 510L passed all the safety tests specified by IEC 100 (EN61010) and their designs have met all the qualifications to carry the TUV safety listing. The 520L, listed by TUV under certificate number S9955405, is designed to be connected to the company's other safety instruments to form a complete system. Listed under TUV certificate number S9955656, Model 510L is designed to be used as a fully-automated standalone tester.