Surface Roughness Gauge : RTD-200

Surface Roughness Gauge : RTD-200

Surface Roughness Gauge : RTD-200

RTD-200 is a surface roughness gauge packed full of features that measures in multiple parameters including Ra, Rz, Rq, Rp amongst others.  Software is included for data management and  the gauge features a protruding stylus suitable to measure inside holes and curved surfaces that makes this device suitable for most applications.


$ 1,995.00+GST

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Starr Instruments RTD-200 Surface Roughness Tester suits users with varied range of surface testing requirements and includes detailed data analysis.

Generally the RTD-200 is used to test the roughness of surface finishes, both raw and machined in work shops or laboratory.  Surface roughness 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 and by making surfaces smoother than needed it can create additional expense in the manufacturing process.  

A great example of use is to check the condition of expensive moulds used in the production of glass bottles. The surface of these moulds needs to be closely monitored to ensure a high quality, clear bottle is formed and can be easily removed from the moulds after pouring. An Ra gauge can quickly measure the roughness of the mould to allow a decision as to if a mould needs to be refinished or not.

The RTD-200 works by a running a diamond tipped stylus over a surface to trace the profile of the material. 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. Results are displayed on the screen and can be saved to memory and transferred to your PC for further detailed reporting and analysis.


  • • 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