The A.R.T. measurement tool is an pointing device for measurement or medical applications. In this specialized field it is very important to measure positions of points in high accuracy. For that reason the measurement tool is constructed.
The A.R.T. measurement tool is equipped with a measurement tip. Together with the appropriate DTrack Module you can measure the position of the tip with the optical tracking system.

The pointing device, which is part of the standard delivery, carries a target, that was developed to get optimal tracking quality for the use with two IR cameras.
Normally the position of the tool's tip is measured in DTrack's room coordinate system (fixed during room calibration). Optionally the A.R.T. measurement tool can calculate the position relative to a "reference body" (i.e. in it's body coordinate system). Refer to 'ARTtrack & DTrack Manual' about how this coordinate system is defined during body calibration.