There are at least two different artifacts our METROTOM Technicians may utilize.  Further, some of our customers have also invested in their own artifact to perform their own accuracy checks in between calibrations.

There is a less common artifact called the nano check.  Our customer US Conec makes use of this.

The two more common are called the cupcake (22 spheres) and the birthday cake (27 spheres).

Like any other artifact, AMS may sell these (typically on the Webshop) and AMS may also sell re-certifications which are performed in Germany (see separate article).