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Surface Roughness Analyzer


The smooth solution for rough surfaces

SRA Surface Roughness Analyzer

Whether your surface must be very smooth, show a certain texture or degree of roughness, our SRA Surface Roughness Analyzer supports you in optimizing your material or production process. Contactless, quickly, and with an extremely high resolution, the SRA gives you a 3D image of your sample‘s surface and provides you with data which exactly describe its topography. ;Analyses with the ; SRA help you evaluate the contribution of roughness to the wettability of your sample or to the adhesion of coatings.


  • Coatings and other surface modifications

  • Biocompatibility of implants

  • Bonding processes

  • Construction and building material

  • Evaluation of how surface roughness contributes to wettability

Measuring methods

  • Analysis of the topography of solid surfaces using confocal microscopy

Measuring results

  • Displaying the topography of samples on a wide scale from surface roughness up to the shape of whole workpieces

  • Calculation of sample parameters such as dimensions, angles, radii

  • A vast amount of surface and profile

  • Analyses according to different standards, such as ISO 25178

  • Roughness factor according to Wenzel

  • Direct data evaluation in optional MountainsMap® software

Technical innovations for precision and speed

The SRA uses the confocal microscopy technique to create the spatial representation of the surface. This happens by stacking layers of 2D images, each one with a very small depth of focus, while lowering the optics with extremely tiny increments, leading to a height resolution of down to 10 nanometers. To scan an area of the sample, usual confocal microscopes use a rotating pinhole disk to create an image at each height level. The disk inside the SRA has micro lenses instead of just holes, increasing the light yield and making it possible to analyze low-reflectivity or even transparent surfaces.


For the standard version of the SRA, the vertical transport of the measuring head uses an ultrasonic instead of a common piezo drive. Thus, while combining speed with a high resolution, the usual height range of the measurement is widely exceeded. To reach a vast scope of tasks from roughness analysis to imaging the exact shape of whole products such as screws or tooth implants, lenses with magnifications from 2.5 to 100-fold can be exchanged quickly and easily.


The SRA is also available as SRA Basic for less frequent measurements where maximum speed and resolution are not required.

Microlens disc
Topographic 3D analysis of the same microlens disc