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 435011 Counting Chamber for zooplankton, volume approx. 2 Price on request 438001-001 Spare Net Bag for Plankton Nets No. 438 001 Price on request 435022 Tubular Plankton Chamber, capacity 10ml Price on request