Accurate, disposable coverslips are used to analyze growth or demarcate areas in tissue cultures. Made from the highest-prsilicate glass, these coverslips are 1 in squared. The 1 x 1-mm, laser-etched grid is subdivided into 100 precise viewing areas. Coverslips are with a grid on one side and a 5-mm diameter centering ring on the other. Packaged in a convenient snap-top box.