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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 73 | MEASURING AND TESTING |
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| 1.01 | INSTRUMENT PROVING OR CALIBRATING |
| 1.02 | Gas or liquid analyzer |
| 1.08 | Dynamometer |
| 1.09 | Torque |
| 1.13 | Weight |
| 1.14 | Rotor unbalance or a roller having a smooth surface |
| 1.15 | Load cell (e.g., strain gauge or piezoelectric sensor) |
| 1.16 | Volume of flow, speed of flow, volume rate of flow, or mass rate of flow |
| 1.17 | Plug with leak detector |
| 1.18 | Sphere |
| 1.19 | Piston |
| 1.24 | Tracer |
| 1.25 | Orifice or restriction |
| 1.27 | Turbine, geared meter, pulse activated, or counter |
| 1.29 | Anemometer or pitot tube |
| 1.31 | With liquid level monitor or timer |
| 1.33 | With floating element or weighing |
| 1.34 | With signal processing, span or set point adjustment (e.g., zero correction) |
| 1.35 | With pressure measurement or plural flowmeters |
| 1.36 | Metering dispenser |
| 1.37 | Speed, velocity, or acceleration |
| 1.42 | Timing apparatus (e.g., fuse, camera, or shutter) |
| 1.43 | Chronometer (e.g., clock, watch, or watch unbalance) |
| 1.44 | Using antenna or radio frequency (RF) |
| 1.45 | Using optical sensor or element |
| 1.48 | Using sound sensor or piezoelectric vibration sensor |
| 1.52 | Plural watches |
| 1.53 | With resilient element |
| 1.56 | Optical instrument (e.g., camera shutter) or optical sensor |
| 1.57 | Fluid pressure |
| 1.58 | Vacuum |
| 1.59 | With signal correction or processing |
| 1.65 | Dead weight type |
| 1.66 | Varying |
| 1.68 | With piston and cylinder |
| 1.69 | Using or containing liquid |
| 1.71 | Pressure activated device |
| 1.73 | Liquid level or volume measuring apparatus |
| 1.75 | Angle, direction, or inclination |
| 1.79 | Displacement, motion, distance, or position |
| 1.82 | Apparatus for measuring by use of vibration or apparatus for measuring vibration (e.g., acoustic or ultrasonic) |
| 1.83 | Liquid |
| 1.84 | Rotary or rotor unbalance |
| 1.85 | Seismic (e.g., geophone) or with optical sensor |
| 1.86 | Reference standard detail |
| 1.87 | Centrifuge |
| 1.88 | Span or set point adjustment (e.g., zero correction) |
| 1.89 | Roughness or hardness |
| 7 | BY ABRASION, MILLING, RUBBING, OR SCUFFING |
| 9 | FRICTIONAL RESISTANCE, COEFFICIENT OR CHARACTERISTICS |
| 11.01 | TESTING IMPACT DELIVERING DEVICE (E.G., A HAMMER) |
| 11.04 | TESTING OF SHOCK ABSORBING DEVICE (E.G., AUTOMOBILE SHOCK ABSORBER, GUN RECOIL APPARATUS, ETC.) |
| 11.05 | Torsional vibration damper |
| 11.06 | Railway draft gear |
| 11.07 | In situ vehicle suspension |
| 11.09 | By applying reciprocating or oscillating motion |
| 12.01 | TESTING BY IMPACT OR SHOCK |
| 12.02 | Resilient ball (e.g., golf ball, baseball, etc.) |
| 12.03 | Typewriting ribbon or carbon paper |
| 12.04 | Accelerated or decelerated specimen (e.g., propelled or dropped specimen support carriage) |
| 12.08 | Specimen directly subjected to a fluid pressure pulse or wave |
| 12.09 | Specimen impactor detail |