Package of 250 Base Plates, diameter 27.5mm Back Catalog number: 435035 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 438001 Surface Plankton Net acc. to Apstein Price on request 435011B Counting Chamber for zooplankton, dimensions 80 x Price on request 435021 Tubular Plankton Chamber, capacity 5ml Price on request