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.

A calibration certificate of PTB (Physikalisch Technische  Bundesanstalt) is only available on special request. Please ask for  terms and delivery.

Артикул Цена Количество
H8 95064.3
597--H8 153381.45