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 435098 Set of 10 Spare Dilution Bottles 250ml Price on request 435016 Plankton Chamber acc. to Kolkwitz, capacity 1.0ml Price on request 438030 Plankton Net for qualitative collection Price on request