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 435015 Plankton Chamber acc. to Kolkwitz, capacity 0.5ml Price on request 438030 Plankton Net for qualitative collection Price on request 438001 Surface Plankton Net acc. to Apstein Price on request