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Surftest SJ-411 / SJ-412 Portable Surface Roughness Testers

High precision, portable Mitutoyo surface roughness testers with a dedicated control unit equipped with analysis functionality rivalling that of benchtop surface roughness testers, complying with the latest international standards applying to surface roughness measurement. The color-graphic LCD has excellent visibility for displaying calculated results and assessed profiles. This is useful for checking results without printing them out. A backlight improves usability in dimly lit environments. The built-in high quality, high-speed thermal printer provides hardcopy of measurement results when required including BAC and ADC curves in landscape format, just as they appear on the screen. The choice of models provides a measurement range of 25mm or 50mm. Password protection for setups is available for preventing accidental changes to settings. A manual adjustment knob enables fine positioning of a small stylus for positioning, which is useful when testing the inside surface of small holes. The instrument can be used stand-alone or mounted on a user-supplied stand. Many optional accessories are available to extend the application range.

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  • No. 178-581-02
  • Model SJ-411, SJ-412
  • Measuring range 25mm / 1 inch (X axis, SJ-411), 50mm / 2 inch (X axis, SJ-412), 800µm, 80µm, 8µm (Z1 axis)
  • Measuring speed 0.05, 0.1, 0.2, 0.5, 1.0mm/s (0.002, 0.004, 0.02, 0.04 inch/s)
  • Measuring method Skidless / skidded measurement
  • Drive unit 128 x 35.8 x 46.6mm (5.04 x 1.41 x 1.83 inch) (Size), 0.6kg (Mass)
  • Measuring Force 0.75mN or 4mN
  • Resolution 0.001µm
  • Stylus tip radius 60°/ 2µm
  • Power consumption 50W
  • External I/O USB I/F, Digimatic output, RS-232C I/F, External SW I/F
  • Power Supply Two-way power supply: battery (recharageable Ni-MH battery) and AC adapter. Charging time: 4 hours. Endurance: 1500 measurements (differs slighty due to conditions/environment)
  • Base size 275 x 198 x 109mm (10.83 x 4.29 x 7.80")
  • Mass 1.7kg (Display unit), 0.4kg (Height adjustment unit), 0.6kg (Drive unit)

There are 4 variations available

Model No. Detector measuring force Measuring range
SJ-411 0.75mN 25mm
SJ-411 4mN 25mm
SJ-412 0.75mN 50mm
SJ-412 4mN 50mm


  • Equipped with 38 roughness parameters that conform to the latest ISO, DIN, ANSI and JIS standards.
  • A wide-range, high-resolution detector and a drive unit provide superior high-accuracy measurement in its class.
  • A skidless detector and a curved surface compensation function provide efficient evaulation of cylinder surface roughness.
  • Ultra-fine steps, straightness and waviness can be measured by using the skidless measurement function.
  • Measured data can be output to a PC with a RS-232C cable (optional).
  • Supplied with a calibrated roughness standard.
  • Digital filter function for non-distorted roughness profiles.
  • GO/NG judgement function.
  • Auto-calibration function.



Ra, Rq, Rz, Ry, Rp, Rv, Rt, R3z, Rsk, Rku, Rc, RPc, RSm, Rmax, Rz1max, S, HSC, RzJIS, Rppi, Rq, RIr, Rmr, Rmr(c), RoX, Rk, Rpk, Rvk, Mr1, Mr2, A1, Vo, Aa, Aq, Lo, Rpm, tp, Htp, R, Rx, AR, W, AW, Wx, Wte, Possible customise.


FREE Download of Communication Software

We would like to offer you a free copy of our Surftest SJ-201P, 210, 301, 310, 401, 402, 411, 412, 500, SV-2100 Communication program, which enables easy use of the communication function to save and print measurement results. Download here

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If you have bought a Mitutoyo product where the order is not placed online please refer to the terms and conditions relating specifically to that order. The following terms and conditions only apply to online orders of small tools.

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  • Next Working Day: £5.00
  • Next Working Day Before 12.00pm: £15.00
  • Next Working Day Before 10.30am: £19.00
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  • Saturday morning: £26.00

(All prices stated above exclude VAT)


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