The standard (H8) is used for a very precise z-calibration of the scanning mechanism. The standard consists of multiple areas of hole and stripe arrays etched into silicon.
This standard has been developed in close cooperation with the German national authority of standards: PTB (Physikalisch Technische Bundesanstalt). Due to this PTB is able to certify this standard in accordance with international guidelines. Please contact Working Group 5.25 Scanning Probe Metrology at www.ptb.de directly.