The most popular ID/OD measuring instrument

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Labmaster Universal - Model 175
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.

High accuracy is maintained by its laser interferometer, zero Abbe offset design, and large measuring table (100 lb [45 kg] capacity) with center position, height, pitch, and yaw controls. The computer-controlled precision air bearing slide and gaging probes 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. The large measuring table also acts as a soak plate.  By design, the weight of the part will not affect the measurement because the table support is independent of the air bearing slide. This is not the case with traditional methods. 

The ULM is capable of measuring gage blocks, end standards, plain rings, threaded rings & plugs, API gages, pin & plug gages, tapered plugs, cylindrical setting gauges, micrometers, indicators, LVDTs, calipers, and snap gauges with instrument uncertainty to 2 millionths of an inch (0.05 micron). It is suitable for virtually all ID and OD gage calibration applications through its wide 0.020-inch (0.5 mm) to 14-inches (356 mm) measuring range. Only a handful of traceable masters, such as blocks, rings, etc. are needed (not included). The ULM includes Pratt & Whitney’s GageCal software that automatically enters tolerances for rings, plugs, pins, balls, threads (calculates pitch/major diameter) and flags out of tolerance conditions.

The Labmaster Universal Model 175 can also be configured around your bearing requirements to measure a wide range of anti-friction bearings; a new lab concept in industry (Model BM175; Bearing Measuring Instrument). The five basic types of anti-friction bearings can easily be measured on the ULM.  They include: tapered roller bearings, needle roller bearings, ball bearings, spherical roller bearings, and cylindrical roller bearings. Measuring characteristics include: internal diameter, external diameter, outer raceway diameter, inner raceway diameter, radial internal play (radial internal clearance/play) and axial clearance (axial internal clearance/play).  Other specialty measuring applications include: gears, shafts, optics, film thickness, nano gages, automotive parts, aerospace parts including aircraft engine parts, and your precision concept components can all be measured on the ULM. 

Geometric measuring characteristics related to size include: positional tolerance (on axis), parallelism, perpendicularity, angularity, total runout (pass/fail). 

New Capability:  ID/OD/SD*  

  • SD = Same-side Dimension (SD = both probes travel in same direction; For example: measurement of step gages)

The Labmaster® Universal Model 175 measures:

  • Your Precision Parts
  • Spheres
  • Ring Gages
  • Gage Blocks / Slip Gauges
  • Setting Standards (Frames, Rods)
  • End Standards / Ball Bars for CMMs
  • Threaded Rings & Plugs (NPT) 
  • Tapered Rings & Plugs
  • Pin & Plug Gages
  • Taper Threads - Pipe Threads (API Gages)
  • Cylindrical Setting Gages
  • Segment Gages 
  • Ball Bearings
  • Coating Thickness Gage Standards 
  • Rolling Bearings (Tapered, Cylindrical, Spherical, Needle)
  • Shafts
  • Micrometers
  • Dial / Test Indicators & Dial Calipers
  • LVDTs / Glass Scales
  • Electronic Vernier Calipers
  • Rulers
  • Lead Gage Setting Standards      
  • Snap Gages
  • Variable Screw Thread Gages (Tri-Roll)  
  • Taps, Dies, and Cutting Tools
  • Feeler Gages 
  • Gears / Splines
  • Dial Bore Gages / Swing Gages
  • Master Setting Bars, Setting Masters, CMM Masters, Precision Parts



Pratt & Whitney Measurement Systems
Pratt & Whitney Measurement Systems is a global supplier of ultra-precision metrology instruments, inspection gaging systems, and length measuring machines. Our comparator instruments incorporate the latest in laser and sensor technology allowing for fast and accurate measurements. Industry applications span across a wide range including, but not limited to: aerospace components, automotive parts, medical devices, thin film materials, roller bearings (tapered, cylindrical, spherical, needle), transducers, optical components, semiconductor devices, gear-spline-thread assemblies.

Calibration laboratory applications include: gage blocks, internal and external threads, national pipe threads (NPT), cylindrical plugs, pin gages, ring gages, dial / test indicators, length standards, taper gages, micrometers, calipers, snap gages, disc masters, API gages, thread wires, bore gauges, and your precision parts. Accredited by A2LA to ISO/IEC 17025:2005 (cert# 2629.01).