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 438030 Plankton Net for qualitative collection Price on request 435015 Plankton Chamber acc. to Kolkwitz, capacity 0.5ml Price on request 435010 Counting Chamber for zooplankton, volume approx. 9 Price on request