Surface roughness tester SRT5000

Portable Surface Roughness Measurements to determine the Rz, Ra, Rq and Rt values

The portable surface roughness tester SRT5000 is a new product featuring highly accurate measurements, a large measuring range, and excellent performance. The device is very well suited for use on metal and non-metal. Thanks to its handy size and integrated probing system it can be used effortlessly in on-site manufacturing processes.


  • Surface roughness tester offering excellent value for money
  • Piezoelectric probing system
  • OLED liquid crystal, illuminated display with adjustable contrasts
  • Dynamically shows measuring progress on the display
  • Rechargeable, long-life, fast-charging lithium-ion batteries
  • Acoustic and visual warning signals when lithium-ion batteries are low
  • Integrated sliding cover to protect the probe stylus
  • Turns itself off automatically after 2 minutes
  • Acoustic „Start Test Ready“ signal
  • Ra, Rz, Rq and Rt roughness parameters in a single device
  • Easy calibration using the keyboard
  • Full LCD dot matrix and interface notifi cations
  • DSP chip for data processing and calculation (enables fast data processing)


  • Measures roughness of hard surfaces
  • For example at: Labs, measuring rooms, workshops, engineering facilities, and many more

Measuring principle

During the measuring process, the sensor makes inline movements along the probing path. The stylus moves up and down in accordance with the probing path profile. These movements are translated into electric signals, which are amplified, filtered and converted into digital signals using an A/D converter. The CPU then processes these signals as Ra and Rz results (or Rq and Rt results) and shows them on the display.

Surface roughness tester SRT5000 - Service case

Standard delivery range

  • Device SRT5000 with integrated micro probe
  • Roughness standard
  • Battery charger
  • Service case
  • Operating instructions


All SaluTron® gauges correspond to national (DIN) and international (ISO, BS, ASTM) norms and possess the CE-sign.
Specifications are subject to change without prior notice.

Roughness parameters Ra (ISO), Rz (DIN), Rq, Rt
Units of measurement μm, μinch (adjustable)
Measuring range Ra, Rq: 0.05 – 15.0 μm
Rz, Rt: 0.1 – 50 μm
Accuracy ±15%
Repeatability <12%
Cut-off length 0.25 mm / 0.80 mm / 2.50 mm
Filter RC
Display LED, blue
Probing path 6 mm
Probing speed 1.0 mm/Sec.
Accuracy Acc. to ISO class 3, EN55022, EN60555-2, EM60555-3, EN50088-1
Measuring principle Probing system, piezoelectric
Stylus Diamond, 10µm ± 1µm radius
Power supply 3.6V lithium-ion batteries, 9VDC charger
Dimensions L106 x W70 x H24mm
Weight 200 g
Calibration With CAL function (using the keyboard)
Minimum diameter of cylindrical parts 40mm (V groove)
Main functions Reading selection: Ra, Rz, Rq, Rt; measuring length adjustment; calibration function; automatic charge status control with acoustic signal; battery charging function, tester can be used while battery is charging.
Environmental conditions Operating
– 0°C– 40°C ambient temperature
– < 80% relative humidity
– Avoid vibrations; do not measure corroded surfaces