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Catalase crystals, negatively stained, are mounted on a grid. They display very clear lattice plane spacings in the TEM and STEM of 8.75nm and 6.85nm. Wrigley, J, (1968). Ultrastructure Res, 24, 454. Valuable for high magnification calibration.
PELCO® Technical Notes, Catalase Crystals (78KB PDF)
Thin films of carbon which have been treated to obtain a large number of small holes. Supported on a G400, 400 square mesh copper Gilder grid. Examination of the Fresnel fringe around the hole when the objective lens is slightly defocused enables astigmatism to be corrected. Observation of the fringe also gives an indication of TEM stability and available resolution.
PELCO® Technical Notes, Astigmatism Correction, Holey Carbon Film (186KB PDF)