The RTD-200 Surface Roughness Gauge by Starr Instruments is designed for users that have a wide range of surface finish 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 maximum sensitivity and measurement accuracy, whilst causing minimal marring to the surface.

It features multiple test parameters and adjustable cut-off and filter setting options for thorough testing to common industry standards.   

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 profilometer 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 can be much more expensive and time consuming, so a balance between wear and production costs can be achieved 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 test parameters
• OLED screen
• Data output and management

Standard kit includes the main unit, stylus sensor (TS100), Ra specimen (for calibration), sample support, height support (adjustable), power adapter, USB cable and software download.
A range of optional styluses are also available at additional cost for small hole access, curved surfaces, deep grooves and recessed or stepped surfaces
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) x "L"
Interface USB
Power Built in rechargeable battery
Detection Principle Current induction
Stylus Force 4mN (0.4gf)
Stylus Angle 90°
Calibration Template  0.8µm Ra specimen included





Length: 160mm

Width: 60mm

Height: 45mm

Model # kr220
Shipping Weight 2.5000kg
Shipping Width 0.360m
Shipping Height 0.120m
Shipping Length 0.300m
Shipping Cubic 0.012960000m3

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