Quick view Add to Cart The item has been added ETher ASIG021B, Dual Conductivity Reference Standards, Aluminum Alloy 1200-H4 (Nominal Value 57.2-60.5 %IACS) and Brass CZ121 (Nominal Value 23.3-26.6 %IACS) (SigmaCheck) NIST VALUES MSRP: Was: Now: $744.00