If a large direct reading range is important to you, choose the Labmicrometer Model 900 or 1600 measuring system. Designed for gage calibration laboratories and shop floor environments requiring precise internal and external measurements over long lengths.
With instrument uncertainty to 2 millionths of an inch (50 nanometers), the Labmaster Universal - Model 175 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.
The Labmaster Universal Model 1000A is designed to measure ID/OD parts and gages with unmatched speed and accuracy. This video demonstrates internal thread measuring.