Package of 50 Cover Plates, diameter 33mm Back Catalog number: 435028 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 435021 Tubular Plankton Chamber, capacity 5ml Price on request 5065M-310 Surface Catch Net Price on request 438010 Plankton Net for quantitative collections with cow Price on request