Abstract: Methods and systems for measuring cathodic protection of a metallic structure using a plurality of coupons, the method including electrically coupling a first coupon to the metallic structure, the first coupon being electrically connected to a reference cell and including a first material, electrically coupling a second coupon to the metallic structure, the second coupon being electrically connected to the reference cell and including a second material, electrically coupling the first coupon to the second coupon, applying a first cathodic protection current to the metallic structure, interrupting the application of the first cathodic protection current, measuring voltage between the electrically coupled first and second coupons and the metallic structure while the application of the first cathodic protection current is interrupted, and determining whether a degree of cathodic protection applied to the metallic structure is sufficient based on the measured voltage.