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 435012 Counting Chamber for zooplankton,volume approx. 70 Price on request 435022 Tubular Plankton Chamber, capacity 10ml Price on request