Laser Micrometer

A laser micrometer is a type of gauge or tool used for inspection or calibration which typically resides on a work bench that measures length whose accuracy and precision is measured in microinches or submicrons.
The Labmaster Universal Model 175 is the most widely used laser micrometer that can measure just about any manufactured precision part or gage such as pins, plugs, rings, and all types of threads including: API, NPT, NPTF, Dryseal, BSPP, BSPT, UN (Unified), M Profile (Metric), ACME, Buttress, UTS, UNC, UNF, UNEF, UNS, BSW (Whitworth), BA, BSC, BSF, BSP.  

With instrument uncertainty to 2 millionths of an inch (50 nanometers), the Labmaster Universal Model 175 laser micrometer is suitable for virtually all Internal (ID), external (OD), and same side dimension (SD*) measuring applications. This laser-based universal length measuring system (ULM) has been developed by Pratt & Whitney for gage calibration laboratories that need to precisely measure length, outside diameter, inside diameter, pitch diameter, lead, major/minor diameter, taper, linear displacement, and thickness.  
High accuracy is maintained by its laser interferometer, zero Abbe offset design, and large measuring table with center position, height, pitch, and yaw controls. Unlike laser scan micrometers, the Labmaster Universal is contact-based and the laser interferometer is coupled to probes resulting in higher accuracies over scan-type devices.  The computer-controlled precision air bearing slide and gaging fingers remove operator-influenced errors commonly observed with traditional gaging methods by maintaining constant force. It also greatly minimizes wear and tear to both the measuring standards and the instrument.