Package of 50 Cover Plates, diameter 33mm Back Catalog number: 435028 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 435025 Combined Plate Chamber (Utermöhl-Chamber), set wit Price on request 435011 Counting Chamber for zooplankton, volume approx. 2 Price on request 438055-001 Repair Set for Net Bucket No. 438 055 Price on request