Choosing the right measuring machine
Optical, vision, CMM, or form measurement: how to match the machine to the part, the tolerance, and the volume.
No single measuring machine handles every job. The right choice depends on the part, the tolerance you need to hold, and how many pieces you check. This guide covers the four kinds of precision measuring machine MESCO supplies (optical, vision, coordinate measuring machines, and form measurement) so you can match the machine to the job and avoid buying too much machine or too little.
When hand tools stop being enough
Micrometers, calipers, and height gauges are where most shops start. They reach their limits in a few predictable ways:
- Each part takes longer to set up and align, and every setup is a chance for error.
- Measuring range and resolution are limited.
- Many 2D measurements and complex part shapes are hard or impossible to check.
- Form tolerances such as flatness, roundness, and profile are difficult to verify.
- The tools need regular upkeep and are easily damaged in daily use.
- Operators need ongoing training, and the tools need proper storage.
When a part’s tolerance, shape, or production volume outgrows what hand tools can reliably verify, it’s time to look at a measuring machine.
What to consider
- Material of the parts you measure
- Size range and tolerance you need to hold
- Surface of the parts
- Complexity of the part’s shape
- Volume: one-off and R&D work, or mass production
- Investment against the return you expect
The sections below group the machines by these factors, from simple manual setups to fully programmable CNC systems.
Optical measuring machines
Best for low-volume, template-style checks, where an operator compares a part’s silhouette or features against a reference.
| Machine | Best for | Limits |
|---|---|---|
| Profile projector Mitutoyo PJ series |
Low-cost silhouette and template checks | Manual alignment; parts up to 10 kg; results depend on the operator’s judgment |
| Large-screen profile projector Mitutoyo PV series |
Template measurement on a 500 mm screen | Same manual limits as above |
| Heavy-duty profile projector Mitutoyo PH series |
Heavier parts, up to 30 kg | Not suited to mass production |
| Measuring microscope Mitutoyo MF and MF-U series |
Fine detail, accuracy to 10 µm | Manual axis movement; 400 mm measuring range |
All optical machines make the same trade: a low investment, but they aren’t built for production volumes, and the result is only as good as the operator’s judgment.
Vision measuring machines
CNC vision systems are the step up from optical machines when volume and accuracy both matter.
- Mitutoyo Quick Vision (Quick Vision Active, Quick Vision Hyper): CNC-controlled and built for mass production, with accuracy to 1.5 µm and a measuring range up to 600 mm in X and Y. A higher investment, but results are consistent and don’t depend on the operator.
- Touch-trigger probe option: lets the same machine combine 2D vision measurement with 3D probing on one part.
Move to a vision machine when template-style checks can no longer keep up with production or hold the accuracy you need.
Coordinate measuring machines (CMM)
CMMs are the most versatile category, from manual entry-level machines to automated, shop-floor, large-format, and portable systems.
| Type | Best for | Limits |
|---|---|---|
| Manual CMM Mitutoyo CRYSTA-Plus M574 |
Low volume and a lower investment | Accuracy to 5 µm; moving the axes by hand adds error; not suited to complex parts; fewer probe options |
| CNC CMM Mitutoyo CRYSTA-Apex V |
Mass production and complex parts; accuracy to 1.5 µm with a wide range of probes | Higher investment |
| Shop-floor CNC CMM Mitutoyo MiSTAR 555 |
Inspection beside the machines, on the shop floor, with low maintenance | Sized for small and mid-size parts |
| Large CNC CMM Mitutoyo CARBstrato |
Heavy and oversized parts | Needs floor space and a controlled room |
| Portable CMM FARO Quantum Max FaroArm |
R&D, reverse engineering, large parts, and measuring on site; reach up to 4 m | Lower accuracy (±20 µm); not for mass production |
CNC CMMs also take optional probes: high-accuracy scanning probes, non-contact laser line probes for reverse engineering, vision probes, and surface roughness probes. One machine can then cover several inspection jobs.
Form measurement
Use form measurement when a drawing calls out surface roughness, contour, roundness, or cylindricity. These are tolerances a CMM or vision system isn’t built to verify.
| Type | Best for | Limits |
|---|---|---|
| Portable roughness tester Mitutoyo Surftest SJ-210 and SJ-410 |
Low-cost spot checks; the SJ-410 handles more complex parts | Not for mass-production checking |
| CNC roughness measuring machine Mitutoyo Formtracer Avant |
Mass production; accuracy to 0.03 µm, with styli for complex parts | Higher investment |
| Contour measuring machine Mitutoyo Contracer CV series |
Simple contour checks at low cost | Not for mass production |
| CNC contour measuring machine Mitutoyo Formtracer Avant |
Mass production and comparison against CAD; accuracy to 2 µm | Higher investment |
| Roundness measuring machine Mitutoyo Roundtest RA series |
Roundness and cylindricity | Entry-level manual models are available |
You’ll hear Mitutoyo’s family names in quotes and on drawings: Surftest for surface roughness, Contracer for contour, Formtracer for machines that measure both, and Roundtest for roundness and cylindricity.
Quick reference
| If you need to… | Look at |
|---|---|
| Compare a part’s silhouette to a template, at low volume | Optical: profile projector or measuring microscope |
| Check 2D dimensions at production volume and high accuracy | Vision: CNC vision measuring machine |
| Verify complex 3D shapes and GD&T features | CMM: manual for low volume, CNC for mass production |
| Check large or oversized parts | Large CNC CMM |
| Measure on the shop floor, next to the machines | Shop-floor CNC CMM |
| Reverse engineer a part or measure on site | Portable CMM |
| Verify surface roughness, contour, or roundness | Form measurement: Surftest, Contracer, Formtracer, or Roundtest |
See the full range on our Metrology tools and machines page. Mitutoyo measuring machines are on the floor at our Technology Center in Pasig, so you can see one measure before you decide. Once a machine is in, our ISO/IEC 17025 accredited lab keeps it calibrated.
Adapted from the Metrology team’s seminar on choosing precision measuring instruments. See Seminars and training for upcoming courses.
Talk through your part with our Metrology team
Tell us what you measure and how many. We'll recommend a machine and set up a demonstration.