This poster describes the testing that was performed both internal and external to National Atmospheric Deposition Program’s Atmospheric Mercury Network (AMNet), presents results from that testing, and evaluates the Tekran Instruments Corporation (“Tekran”) mercury analyzer model 2537X with regard to: target specifications, field testing, controlled testing, and usability as required for network use.  In addition to Tekran 2537X test results, additional results from collocated performance tests in this study also include earlier models of Tekran’s ambient mercury analyzer (i.e., model A and model B) for completeness. The performance tests include two separate bench tests performed at the AMNet site liaison’s laboratory in Mount Horeb, Wisconsin, collocated measurements at the AMNet site in Horicon Marsh, Wisconsin (WI07), collocated measurements from two Canadian Atmospheric Mercury Measurement Network (CAMNet) monitoring sites, and in-house performance results supplied at Tekran’s headquarters in Toronto, Ontario.