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 5065M-310 Surface Catch Net Price on request 435012 Counting Chamber for zooplankton,volume approx. 70 Price on request 435011A Counting Chamber for zooplankton, dimensions 80 x Price on request