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Negatively stained catalase crystals.

High resolution test specimen with a particle size range from approximately 3 - 50nm. Special prices valid while stocks last. 

Ultra high resolution test specimen with a particle size range from approximately <2 - 30nm.

Resolution test specimen with a particle size range from approximately 10 - 100nm.

The various spacings created by the dendritic structure of this specimen are suitable for performing point resolution tests and the topographical arrangement of the dendrites for a grey level test. Special prices valid while stocks last. 

Low voltage resolution test specimen with a particle size range from approximately <30 - 300nm. Special prices valid while stocks last. 

This specimen is one of the quickest and easiest to use for performance checks since it gives information about nearly all causes of loss of resolution. Special prices valid while stocks last. 

Low voltage resolution test specimen with a particle size range from approximately <20 - 400nm.

An arrangement of finely dispersed thin gold particles has an advantage over single crystal gold foil for tests of high resolution imaging capabilities in TEM.

Universal resolution test specimen with a particle size range from approximately <5nm - 30um. 

Ferritin molecules display a quad structure with a separation of 1.25 nm, which is useful as a resolution check.

The evaporated platinum/iridium specimen is supplied on a perforated carbon support film that provides holes for ease of focus and astigmatism correction.

Unique gold nanoparticles on silicon provide resolution standards with known and uniform particle size, ideally suited for high resolution tests for SEM, FESEM and FIB/SEM systems.

A perforated carbon film is shadowed with gold and graphitised carbon particles are deposited.

Normal resolution test specimens are difficult to see on the viewing screen because of low contrast.

This specimen consists of gold platelets with a wide size range and sharp, clearly defined edges, making it useful for determining and correcting astigmatism, and verifying instrument resolution.

Resolution test specimen with a particle size range from approximately 5 - 150nm.

2-D holographic array standards for simultaneous calibration of X and Y axes.