The four point probe passes a small current though a sample to determine the material’s sheet resistivity, slice resistivity, V/I, and metallization thickness. Extended measurement range displays sheet resistivity up to 450k ohm/sq and down to a resolution of .001 milliohm/sq.
The Alphastep 500 is a stylus-based surface profiler to measure step heights of surfaces. A stylus is placed in contact with, and then gently dragged along the surface of the substrate. The vertical deflection measures the change in step height.