Counting chamber, with CE marking acc. to IVD directive, double ruling, without clamps. With 2 optically plane cover glasses in a transparent plastic box. The central square of 1 mm2 contains 25 groups of squares divided into 16 mini squares of 0.05 x 0.05 mm each. Triple marginal lines at all sides of the square groups distinguish this ruling from Neubauer improved. The middle line is decisive for the counting. Counting chamber, with CE marking acc. to IVD directive, double ruling, without clamps. With 2 optically plane cover glasses in a transparent plastic box. The central square of 1 mm2 contains 25 groups of squares divided into 16 mini squares of 0.05 x 0.05 mm each. Triple marginal lines at all sides of the square groups distinguish this ruling from Neubauer improved. The middle line is decisive for the counting.