Surface Roughness Gauge : RTD-300

Surface Roughness Gauge : RTD-300

Surface Roughness Gauge : RTD-300

The Starr Instruments Surface Roughness Gauge RTD-300 is an advanced model with separate stylus and motor drive unit for greater access into tight spaces allowing tests on even more surfaces.  Advanced data capabilities show the waveform graph on the LCD screen which can be saved into memory for further analysis. 

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The advanced surface roughness gauge RTD-300 from Starr Instruments is designed to allow testing of more difficult to access work pieces and has superior data capabilities to be a comprehensive testing device.

The separate stylus housing allows for measuring the roughness of inside or outside of bores on small diameter pipe or tube, stepped gears, o-ring grooves and recessed notches.  Industry examples include measuring roughness of cylinder heads or brake discs in Automotive or Rail Tracks after refurbishment and maintenance. 

To measure roughness the RTD-300 uses a diamond tipped stylus that accurately traces the surface of the material by measuring the vertical deviations from a uniform centre line and is able to display the results under many parameters including Ra, Rz, Rq, Rp, Rv, Rsk, Rmr to name a few.  The results are displayed on the large, high resolution, colour LCD including the waveform trace of the surface and results can be saved to internal memory and managed with the optional software.


  • • Colour TFT LCD Touch Screen
    • USB and RS-232 data
    • Wide measuring range ±400µm
    • Advanced roughness parameters
    • High accuracy inductance pick up
    • Separate stylus housing and fly lead for accessibility.
  • • Mag stand to assist with measurement

Standard kit includes the main unit, stylus and casing, mag stand, power source, calibration certificate, reticle and reticle stand.

For further assistance please contact us.


Maximum Travel 17.5mm
Indicating Error ±10%
Accuracy ±6%
Measured Profile Roughness, Waviness, Contour
Parameter Ra (0.005µm-16µm) Rz (0.02µm-160µm)
Paramater Rq, Rt, Rp, Rv, R3z, R3y, RzJIS, Rsk, Rsu, Rsm,Rmr, Rx
Filter RC, PC-RC, Gauss, ISO13565
Sampling Length "L" 0.25mm, 0.8mm, 2.5mm, 8mm
Evaluation Length (1-5)L
Interface USB
Power Built in rechargeable battery
Detection Principle Current induction
Stylus Force 4mN (0.4gf)
Stylus Angle 90°
Calibration Template  included



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