Mitutoyo 178-561-12A Surftest SJ-210 Portable Surface Roughness Tester


Mitutoyo’s SJ-210 Series 178-561-12A Surface Roughness tester is the leader in surface inspection. It allows users to perform measurements in any orientation, switch between 16 languages, and view surface roughness waveforms on the built-in LCD.

Product Description

Mitutoyo designed the 178-561-12A  Surfest SJ-210 surface roughness tester as a handheld tool to take anywhere. Small and lightweight, this model is easy to use and delivers accurate measurements quickly. 

178-561-12A Product Features

  • Built-in 2.4″ color graphic, back-lit LCD provides excellent readability, improved visibility and is easy-to-use in dark environments
  • The operation keys on the front of the unit and under the sliding cover are well-labeled and easy to use
  • Internal memory stores up to 10 measurement conditions and one measured profile
  • Password protection prevents unintended operations and protects instrument settings
  • The display interface supports 16 interchangeable languages
  • LCD display mode can be freely switched between portrait and landscape as well as left-hand or right-hand direction
  • High-speed USB communication: Data can be transferred to and from a computer via the high-speed USB interface
  • Memory card support: The memory card slot lets you store large amounts of data onto a memory card
  • The built-in battery allows approximately 1,000 measurements on a full charge.
  • Drive unit can be separated from the display unit by using a cable, allowing more flexible measurement, and can be separated and reattached in one simple step
  • The user-friendly screen layout and arrow keys provide intuitive operability
  • Displayed settings can be changed easily by using the left and right arrow keys
  • Infrequently used keys are hidden under the sliding cover to prevent unintended operations
  • Complies with the following standards: JIS (JIS-B0601-2001, JIS-B0601-1994, JIS B0601-1982), VDA, ISO-1997, and ANSI


  • Customization: Desired parameters can be selected for calculation and display
  • GO/NG judgment: By maximum value/16 %/Standard deviation
  • Storage of measurement condition: Save the conditions at power OFF
  • Storage: Internal memory: Measurement condition (10 sets)
  • Calibration: Auto-calibration with the entry of numerical value/average calibration with multiple measurement (maximum 5 times) is available


  • Aerospace
  • Automative
  • Defense
  • Energy
  • General manufacturing
  • Medical

Additional Information

Weight 1.1 lbs
Measuring Range

X axis: 0.63" (16 mm)

Z axis (detector)

Range: 14400 µin (-7900 to 6300 µin) [360 µm (-200 to 160 µm)]

Range/resolution: 14400/0.8 µin (360/0.02 µm); 4000/0.2 µin (100/0.006 µm); 1000/0.08 µin (25/0.002 µm)

Measuring Speed

When measuring: 0.01, 0.02, 0.03 in/s (0.25, 0.5, 0.75 mm/s)
When returning: 04 in/s (1 mm/s)

Measuring Force/Stylus tip

4 mN/5 μmR 90°

Skid Force

Less than 400 mN

Applicable Standards

JIS '82/JIS '94/JIS '01/ISO '97/ANSI/VDA

Assessed Profiles

Primary profile, roughness profile, DF profile, roughness profile-Motif

Graph Analysis

Bearing area curve/Amplitude distribution curve


Ra, Rc, Ry, Rz, Rq, Rt, Rmax, Rp, Rv, R3z, Rsk, Rku, Rc, RPc, Rsm, Rz1max, S, HSC, RzJIS, Rppi, RΔa, RΔq, Rlr, Rmr, Rmr(c), Rδc, Rk, Rpk, Rvk, Mr1, Mr2, A1, A2, Vo, Rpm, tp, Htp, R, Rx, AR, Possible Customize

Cut Off Length

λc: 0.003, 0.01, 0.03, 0.1" (0.08, 0.25, 0.8, 2.5 mm)
λs: 100, 300 µin (2.5, 8 µm)

Sampling Length

0.003, 0.01, 0.03, 0.1" (0.08, 0.25, 0.8, 2.5 mm)

Number of Sampling Lengths

x1, x2, x3, x4, x5, x6, x7, x8, x9, x10
Arbitrary 0.01 to 0.63" (0.0001" interval) [(0.3 to 16 mm: 0.01 mm interval)]


1.45 x 1.93" (36.7 x 48.9 mm)

Display Languages

Japanese, English, German, French, Italian, Spanish, Portuguese, Korean, Traditional Chinese, Simplified Chinese, Czech, Polish, Hungarian, Turkish, Swedish, Dutch

Measurement Result Display

Vertical: 1-parameter display/3-parameter display/Trace display
Horizontal: 1-parameter display/4-parameter display/Trace display (invertable)


Gaussian, 2CR75, PC75

External I/O

USB I/F, Digimatic Output, Printer Output, RS-232C I/F, Foot SW I/F

Power-saving Function

Auto-sleep off function (10 to 600 seconds)

Power Supply

Two-way power supply: battery (rechargeable Ni-MH battery) and AC adapter
Charging time: about 4 hours (may vary due to ambient temperature)
Endurance: about 1000 measurements (differs slightly due to use conditions/environment)

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