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 435011B Counting Chamber for zooplankton, dimensions 80 x Price on request 435100 Folsom's Plankton Sample Divider Price on request