Surface Roughness Tester RTD-200 by Starr Instruments is designed for users that have a wide range of surface testing requirements.  

The RTD-200 is a contact type surface roughness meter which uses a skidded, diamond-tip stylus that traces across the test surface. The test force is a very low 4mN to ensure ultra sensitivity and measurement accuracy 

It features multiple test parameters and adjustable setting options for thorough testing.  Users can also store up to 100 test results including wave form graphs and conversion value to other parameters.  These can be reviewed or downloaded for interpretation using the included DataView software program (available as a download).  

Commonly utilized to test in a work shop or laboratory, the RTD-200 is used to determine the roughness profile of surface finishes, both raw and machined.  It is important to measure quality and manage manufacturing processes for consistency and fit for purpose.  If a surface is too rough it can wear out more quickly as it has a higher co-efficient of friction.  To make a surface smoother it can be much more expensive, so a balance between wear costs and production costs by analysing the data from surface roughness tests.

The Starr RTD-200 is also suitable for curved surfaces by having a protruding stylus, and the bright OLED dot matrix screen is easy to read in daylight or low light. The software is used for management of data including graphing of results.



• Rugged body
• DSP chip for high-speed data processing
• Large range of parameters
• OLED screen
• Data output and management

Standard kit includes the main unit, stylus sensor, Ra specimen (for calibration), sample support, height support (adjustable), power adapter, USB cable and software download.
A range of optional styluses for small hole access, curved surfaces, deep grooves and recessed or stepped surfaces, are also available at additional cost.
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





Model # kr220

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