The dual-sided conical stylus on the Mitutoyo FTA-C4000 allows for continuous upper and lower face contour measurement, including the effective diameter of screw threads. The selectable measuring force feature eliminates the need to set the measuring force by exchanging weights or switching orientation for faster, more efficient measurements. With an optional surface roughness detector head, the FTA-C4000 can perform both surface roughness and contour measurements quickly the machine’s unique hot swap feature.