Surface Roughness Gauge : RTD-200

Surface Roughness Gauge : RTD-200

Surface Roughness Gauge : RTD-200

The RTD-200 is a feature packed surface roughness gauge measuring in multiple parameters including Ra, Rz, Rq, Rp amongst others.  With included software for data management and a protruding stylus suitable to measure inside holes and curved surfaces, this device is suitable for most applications.



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Our Starr Instruments RTD-200 Surface Roughness Tester is designed for users with a wide range of surface testing with detailed data analysis requirements.

It is commonly used to test in a work shop or laboratory to determine the roughness of surface finishes, both raw and machined.  This is important to measure quality and manage the manufacturing process.  If a surface is too rough it can wear quickly with a higher co-efficient of friction. Conversely it can be expensive in the manufacturing process to make a surface smoother.  

A good example is the maintainence of expensive moulds used in the production of glass bottles. These need to be closely monitored to ensure a high quality, clear bottle is formed and is easily removed from the moulds after pouring. An Ra gauge can quickly determine if a mould needs to be refinished.

Designed with a protruding stylus, the RTD-200 is also suitable for curved surfaces.  The bright OLED dot matrix screen is easy to read in daylight or low light and the 'Dataview' software makes managing data simple including graphing of results.

The RTD-200 uses a diamond tipped stylus to trace the surface of the material and through current induction transmits a signal that the device uses to produce the measurements. The measurements are available in many profiles including Ra, Rz, Rq, Rp, Rv, R3z amongst others. The results are displayed on the screen, save to memory and ouput to your PC for further detailed analysis and reporting.


  • • Easy to use
    • Rugged metal body
    • DSP chip for hi-speed data processing
    • Large range of parameters
    • OLED screen
    • Data output and management

Standard kit includes the main unit, stylus sensor, Ra sample, sample support, height support (adjustable), power adapter, USB cable and software.

For any assistance please contact us.


Maximum Travel 17.5mm
Indicating Error ±10%
Variation of Indication ±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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  • RTD-200 manual Complete user operation manual for RTD-200 Surface Roughness meter