All Jandel probes are built to a high level of mechanical accuracy. Specifications for radii, spacing and planarity are verified by video inspection system and optical interferometer. Loads are verified by electronic force gauge. Each probe has upper and lower jeweled needle guides. The probe manufactured for CDE tools is very similar, however the probes are not inter-changeable and great care should be taken, especially if both systems are in use on site. CDE compatible probe heads have a distinctive black nosepiece.