[ros-users] Calibration Plate

We are looking for a high quality calibration target (something beyond pdf
printout pasted on a plate) like the 4x4 checkerboard shown in the pr2
calibration page:
http://www.ros.org/wiki/pr2_calibration/Tutorials/Calibrating%20the%20PR2

Is it possible to purchase one directly from willow garage or a distributor,
or any hint one how to go about making one ourselves?

Thanks,

Hang
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