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 438025 Spare Net Bucket for Plankton Nets No. 438 001 / 4 Price on request 435011A Counting Chamber for zooplankton, dimensions 80 x Price on request 438015 Spare Net Part for Plankton Nets No. 438 010 and 4 Price on request