Instrument: Plankton sub-sampler
Various devices for sub-sampling plankton samples
Folsom splitter: http://www.aquaticresearch.com/folsom_plankton_splitter.htm
Motoda box splitter: http://www.aquaticresearch.com/motodo_plankton_splitter.htm
Hensen Stempel Pippette: http://www.envcoglobal.com/catalog/product/plankton-counting/hensen-stempel-pipettes.html
Sedgewick-Rafter Plankton Counting Chamber: http://www.benmeadows.com/wildco-sedgewick-rafter-counting-chambers_36816595/
Device for splitting a plankton sample into two approximately equal parts. It uses a hollow cylindrical drum mounted to rotate on a horizontal axis with a semi-circular divider midway between the end walls of the drum.