The new RTD-210 by Starr Instruments is an advanced surface roughness tester that provides the user with comprehensive testing capabilities. It is designed to allow testing on almost any surface, including difficult to access samples. 

The separate stylus drive unit is attached on a 1mt long fly-lead. This is to allow user measurement of the roughness of inside or outside of bores on small diameter pipe or tube, stepped gears, o-ring grooves and recessed notches. 

The RTD-210 uses a highly sensitive, diamond tipped stylus that accurately traces the surface, measuring the vertical deviations from the centre line. It is able to display the results in many parameters including Ra, Rz, Rq, Rt, Rp, Rv, Rsk, Rmr to name a few.  The results are clearly shown on the high resolution, colour touch-screen LCD; including the waveform trace of the surface. Results can be saved to the 100 record internal memory and managed with software or downloaded via Bluetooth to a free Android APP. (no iOS version available at this time).


  • 3.5" Full colour graphic LCD Touch Screen
  • USB communication and charging
  • Wide measuring range ±160µm
  • 22 Advanced roughness parameters
  • High accuracy inductive, diamond stylus/pick up
  • Separate stylus drive unit and fly lead for increased accessibility
  • Adjustable height stand to fine adjust stylus positioning for precise measurement
Standard kit includes the main display processor unit, stylus and motor drive unit, height adjustable stand, touchscreen stylus, USB cable and mains charger, calibration certificate, Ra calibration specimen and specimen holder.

There is also a range of optional styluses that can be used to extend the testing capabilities of the unit and allow measurement on curved or grooved/ recessed surfaces and small pin holes down to 2mm. These can be purchased separately, please contact us for details and pricing.
For further assistance please contact us.
Maximum Travel 20mm
Indicating Error <±10%
Variation of Indication better than ±6%
Measured Profile Roughness, Waviness, Contour
Parameter Ra, Rq (0.005µm~30µm) Rz, R3z, Ry, Rt, Rp, Rm (0.02µm~320µm)
Paramater Rq, Rt, Rp, Rv, R3z, R3y, Rz(JIS), Rs, Rsk, Rsm, Rku, Rmr, Ry(JIS), RMax, RPc, Rk, Rpk, Rvk, Mr1, Mr2
Filter RC, PC-RC, Gauss, ISO13565
Sampling Length "L" 0.25mm, 0.8mm, 2.5mm
Evaluation Length (1-5)L
Interface USB, Bluetooth
Power Built in rechargeable battery
Detection Principle Current induction
Stylus Force 4mN (0.4gf)
Stylus Angle Diamond, 90°, 5µmR






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