The Specimen holder (CS946) effective area is 1cm2 and it's usually used in corrosion field. You can assember different kinds of samples as working electrode. This holder can be used in CS930 4-neck cell, it can also used in CS9350 corrosion cell. Specifications: Effective Working area is 1cm2. Round specimen requirement: diameter: 11.5~15mm, thickness 0.1 ~ 5mm. One face of the sample contacts with the solution.