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 438020 Plankton Net for quantitative collection with cowl Price on request 435011B Counting Chamber for zooplankton, dimensions 80 x Price on request 438061 Surcharge for mesh size < 55µ for nets 438 030, 43 Price on request