Sub-micro Cell, top section, comprising two black walls and two translucent side walls with a square internal cross-section, open top, supplies with non-sealing PTFE cover as well as a vaned lid to provide a liquid-tight seal. To avoid possible meniscus errors, it may be necessary to increase the nominal sample fill volume by at least 20%. May be used with all standard cell holders. Filling and emptying with a pipette is recommended.