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The full contact measuring principle

The magnetic, knife-shaped measuring wheel has full contact to the measured profile during the entire measuring process and ensures that the actual profile is being measured. Combined with rotating high-resolution optical encoders, 30.000 individual collected points in one single measurement and an accuracy range from 9-11 µm, a full contact MiniProf measurement is 10 times more accurate than similar non-contact laser-based measuring systems on the market and reflects the true state of the measured profile.

Full contact vs. non-contact

Contrary to a full contact measurement, similar non-contact laser-based handheld measurements are made without actual contact to the measured profile. This demands an extremely high level of profile attendance prior to measuring as the laser does not distinguish between the profile and any layers of dirt, oil, grease etc. If the profile is not cleaned thoroughly, a laser-based measurement will reflect the profile surface plus any unremoved layers. Obviously, if the collected data does not reflect the actual profile, it can have critical consequences for following decisions in maintenance, safety and budgets. Do you trust your measurement?

What do you measure? The actual profile or the accumulated surface?

Full contact
Measures the true profile with highest accuracy
Cuts through surface contaminants
Not sensitive to light and reflective surfaces
Human tactile sensing and real-time feedback
Makes a scanned picture of the surface
Does not distinguish between dirt and profile
Sensitive to light and reflective surfaces
No tactile or visual feeling with the profile

No sensitivity to reflecting light

A MiniProf system is suitable for use in any working environment as the full contact measuring principle is not challenged by environmental factors.

In contrast, the non-contact measuring principle can be severely challenged by reflective surfaces from the sun, white frost, rain drops, dew on the rails etc. Even reflections from newly turned wheels or rails can disrupt a non-contact measurement.

The environmental sensitivity should therefore be considered carefully when working with laser-based equipment, especially in specific geographical areas dominated by sun, rain or snow and in manufacturing and reprofiling facilities.

Never underestimate the importance of a full contact measurement!

Environmental factors

A full-contact MiniProf system can be used in most types of environments. A non-contact (laser) measuring system can be severely challenged by below interference factors.



Reflecting light



Shiny wheels


White frost

Download our article about the
full contact measuring principle​
Download the MiniProf BT brochure​
Discover MiniProf Academy
Your option for direct interaction and professional discussion with carefully selected and specialized MiniProf Academy partners!
MiniProf Academy

If you plan to visit Rolling Stock Networking in Derby, UK, we welcome you to visit MiniProf agent CoMech Metrology at stand B2 for a presentation of the MiniProf systems and the powerful Envision software.

Learn all about the advantages of the secure and reliable full-contact MiniProf profile measurements and how to benefit from the powerful Envision software in your daily work.

To schedule a meeting in advance, do not hesitate to contact the CoMech MiniProf team.

How can we assist you?

The MiniProf team is here for you! If you have any questions about our MiniProf products, Envision software, Criterion for Android, local agent details, re-calibration or any of our other services, do not hesitate to contact us – we will be pleased to assist.

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General information

Product & software support

Please make sure that your MiniProf instrument and laptop/tablet are fully charged.

Service & re-calibration