A true value for all your microscope calibration needs. In such conditions, exceptionally uniform spheres are obtained. A statistically significant number should therefore be measured. Please note that the certificates covers mean size and does not carry a guarantee of size of any particular particle.
Spheres are available in suspension or uncoated and dispersed on a silicon disc.
This Test Specimen is made of a 5mmx5mm square of single crystal silicon. It is photo-etched and the squares repeat every 10 m. The dividing lines are 1.9 m wide. A broader etching line is written every 500 m, which is useful in light microscopy. This is an excellent test specimen for comparing magnification and assessing any distortion in the image field.