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 435023 Tubular Plankton Chamber, capacity 25ml Price on request 438025 Spare Net Bucket for Plankton Nets No. 438 001 / 4 Price on request 438055 Spare Net Bucket, for Plankton Nets No. 438030 / 4 Price on request