Gold Tester GD320N Atomic Absorption Spectrophotometer Making the characteristic concentration of As, Se, Sb, Bi, Pb, Sn, Te, Ge GD320N Atomic Absorption ... curves displayed in screen and report printing, etc. GD320N Gold Tester is equipped with interface for externally linking PCGood basic line ... concentration of As, Se, Sb, Bi, Pb, Sn, Te, Ge, In, Tl, Cd and Zn lower than ppb level with ...