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 438050 Plankton Net for quantitative collection with cowl Price on request 5065N-190 Deep Catch Net Price on request 435100 Folsom's Plankton Sample Divider Price on request