Graphite Rod Electrode Must Be High Purity Graphite (Spectro Graphic Grade) Suitable For Moa Ii Plus Spectro Graph Meter,Size:-0.24 Inch Dia,6.0 Inch Long Element: Al,B,C R,Cu ,Fe,Na,Mg,Ni,Ca,Si,Sn,Pb, Zn,Mo,P,Ag & Ti Should Be 00 Ppm. Packing: Per Box Tub Contain 50 Num Bers Rods. ]