Counting chambers McMaster with 3 grids

for counting worm eggssuitable for liquid mediadimensions: approx. 127 x 26 mmdepth: approx. 1.5 mmseparate cover glass with 3 counting grids approx. 10 x 10 mm (divided into 10 parts)with 1 pair of clamps to fix the cover glassground edges and ..