We make some of the largest and some of the smallest

artefacts for coordinate measuring machines (CMMs)

available on the market.

Our standard products are the Escalon Bars - for tactile and optical probing. 

The shortest is 80 mm, the  longest 3 m.

Most artefacts are made of carbon fibre composite,

vitro ceramics and alumina ceramics.

This guarantees a maximum of temporal

and thermal stability (very low CTE).

Future Manufacturer of

Trapet-PE Artefacts:



The most accurate ESCALON reference ball beam, made of NEXCERA Ceramics (Krosaki Harima Corporation, Japan).


The thermal expansion coefficient is smaller than 0.1 ppm/K and the long term stability is among that of the best non-monocrystalinavailable materials.


Here 1 m beam with 51 balls. The largest beams are 1.5 m (76 balls).

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Miniature ESCALON

Multi senor ESCALON

Except for the HA ESCALON bars, these bars are made of uni directional carbon fibre composite.

The distances between the centres of the balls are calibrated. The balls lie in the symmetry line between the two beams of carbon fibre. This design yields high stability inlongitudinal direction.

As well the pole point distaqnces can be calibrated, providing the user with so-called bidirectional measures.

These "miniature ESCALON"  bars are made similar to the Standard Escalon Bars, however with smaller balls.

This makes these bars not only suited for small CMMs and Micro CMMs, but as well for optical measurements (video-CMMs multi sensor CMMs) and for tomography systems


Segmented Ball Bar 5 m

Our optical reference bars are made of Vitro-Ceramics with a carbon fibre frame.

Both materials yield high stability.

The carbon fibre frame protects the Vitro-Ceramic glass on which the calibrated chromium grating is deposited.

These ball bars are made of detatcheable structural segments.

On top of the assembled segments calibrated bars are fixed,  

these calibrated bars are helt between balls on pivot elemnts. 

It is possible to furnish all 3D-artefacts

with mat spheres for testing laser

scanners and fringe projection devices. 

Ball Beam with mat spheres

dumbbells for fringe projection system verification, here with 160 mm, 80 mm and 40 mm diameter balls with virtually no volume scattering.

The material of the 160 mm balls is carbon fiber, covered with a fine-lapped paint. The balls up to 100 mm are of aluminium covered with paint and fine lapped to a form error of  < 10 ┬Ám.

We believe that we are the only manufacturers of this type and size of low-volume-scattering spheres.

Dumbbells with lapped mat white surfaces,    up to 160 mm diameter

Miniature Dumbbells

for Tomography, Fringe Projectors, Video CMMs, ball dimeters are here 3 mm, lengths range from 10 mm to 200 mm

Miniature Tetrahedron

for tomography, diameter of balls is here 10 mm, material ruby

This ball plate is made of thermally invariant Carbon fibre rods and Robax (Vitro-Ceramics).

A special feature are the miniature balls which allow tactile and optical probing. The optical probing is improved by an auto-reflex-foil acting as "Virtual Backlight".

L-shaped Ball Plate

Ball Cube

for very thorough checks and analysis of machine performance

Ball Tetrahedron

for extremely fast interim check of CMMs and machine tools

Photogrammetry reference bars

have the same structure as ESCALON bars for tactile measurements but have elements which can be probed tactilely and by photogrammetry and video CMMs.

Here two different types of "innovative" targets are seen