Package of 50 Cover Plates, diameter 33mm Back Catalog number: 435028 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 438061 Surcharge for mesh size < 55µ for nets 438 030, 43 Price on request 438020 Plankton Net for quantitative collection with cowl Price on request 435100 Folsom's Plankton Sample Divider Price on request