Package of 50 Cover Plates, diameter 33mm Back Catalog number: 435028 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 438001-001 Spare Net Bag for Plankton Nets No. 438 001 Price on request 435025 Combined Plate Chamber (Utermöhl-Chamber), set wit Price on request 438040 Plankton Net for quantitative collection with cowl Price on request