A stylus tip directly contacts a sample’s surface when using contact-type surface roughness instruments. The detector tip has a stylus tip that tracks the sample’s surface and electronically detects the stylus’s vertical motion.

In order to be recorded, electrical impulses are amplified and converted to digital form.

The radius of the stylus tip must be as narrow as feasible with light contact pressure in order to correctly measure fine forms and roughness with a contact-type surface roughness tester.

Styluses typically have a tip radius of 10 m (0.39 mil) or less and are composed of sapphire or diamond. For a stylus, a conical form with a ballpoint tip is excellent.

Because they immediately touch the sample, contact-type surface roughness testers offer accurate measurements.

NextGen’s NG-SR400T Surface Roughness Tester has the following sensor stylus tip: Diamond, 90°/ cone angle/5μmR.

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