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Surftest SJ-310 Portable Surface Roughness Tester

A Mitutoyo portable surface roughness tester able to operate independently of mains power and make measurements on almost any part of a workpiece of practically any size. The large 5.7” color LCD with touch-screen functionality improves operability and provides high visibility. Statistical analysis of up to 3 parameters from 300 samples can be performed showing average, standard deviation, max, min, pass rate and histogram. Up to ten measurement setups, along with stored data, can be displayed and printed out on the built-in thermal printer, or stored in the built-in memory. The Micro-SD card (optional) is supported to enable huge storage of measurement values, setups and statistical data, or auto save of the last 10 sets of measurement data. The total measurement and sectional measurement results can be displayed as well as BAC/ADC curves. USB, Digimatic SPC output, RS-232C and external software connectivity is supported. Security is managed via a password lock to eliminate error due to accidental resetting. Cissoidal calculation mode is supported in which one measurement can evaluate two different parameters.

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  • SKU 178-571-02E
  • Model SJ-310
  • Models available SJ-310, SJ-310R and SJ-310S
  • Measuring range 17.5, 5.6mm (Transverse tracing drive unit type)
  • Measuring speed 0.25, 0.5, 0.75 mm/s (returning: 1 mm/s)
  • Measuring method Skidded
  • Drive unit .44Ibs, (0.2kg)
  • Detector range 360 µm (-200 µm to + 160µm)
  • Measuring Force 0.75 mN or 4mN
  • Stylus tip radius Diamond, 90• / R5 µm (60• / R2 µm)
  • Parameters Ra, Ry, Rz, Rt, Rp, Rq, Rv, Sm, S, Pc, R3z, mr (c), Rpk, Rvk, δc, Rk, Mr1, Mr2, Lo, Rppi, R, AR, Rx, A1, A2, Vo, HSC, mr, SK, Ku, RΔa, RΔq, Wte, Wx, W, AW, Rmax, Rz1max, RzJIS, Rlr, Rpm, tp, Htp, λa, λq (can be customised)
  • External I/O USB I/F, digimatic output, RS-232C I/F, EXTERNAL SW I/F
  • Power Supply Two way power supply: battery (rechargeable Ni-MH battery) and AC adapter
  • Data storage Memory card
  • Dimensions 275 x 109 x 198mm (10.83" x 4.29" x 7.80") (Display Unit), 115 x 23 x 26mm (4.53" x 91" x 1.02") (Drive Unit)
  • Mass 1.7kg (3.75Ibs) (Display Unit), 0.2kg (.44Ibs) (Drive Unit)

The Surftest SJ-310 is available in 6 variations

Model No. Drive Unit Detector
SJ-310 Standard type 0.75mN type
SJ-310 Standard type 4mN type
SJ-310 Retractable type 0.75mN type
SJ-310 Retractable type 4mN type
SJ-310 Transverse Type 0.75mN type
SJ-310 Transverse Type 4mN type


  • The handheld data processing unitand the 5.7-inch colour graphic LCD touch-panel provide superior readability and operability. The LCD also includes a backlight for improved visibility in dark environments.
  • The excellent user interface provides intuitive amd easy-to-understand operability.
  • Complies with the following standards: JIS (JIS-B0601-2001, JIS-B0601-1994, JIS-B0601-1982), VDA, ISO-1997 AND ANSI
  • The measure-Start and other frequently used buttons are strengthened to resist wear and the detrimental effects of workshop contaminants
  • Equipped with a large-capacity battery allowing approximately 1500 measurements when fully charged 
  • Includes convienet carrying case for protection in the field
  • A high-speed printer is built into the main unit. Either landscape or portfolio mode can be selected according to the application. Paper saving mode is supported
  • The display interface supports 16 languages, which can be freely switched
  • 10 setups can be saved in the measurement unit. An optional memory card can save setups and the measured profile.


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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General Orders (Not Purchased Online).

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.

Delivery (Online Orders)

Standard (Next Working Day before 5pm) delivery is FREE on all orders over £150. Further express delivery options are available to suit the urgency of your requirements. Simply select the delivery service in the shopping basket. To qualify orders must be placed before 2pm. For the Highlands and Northern Ireland please call us to check

  • Next Working Day: £5.00
  • Next Working Day Before 12.00pm: £15.00
  • Next Working Day Before 10.30am: £19.00
  • Next Working Day Before 9.00am: £25.00
  • Saturday morning: £26.00

(All prices stated above exclude VAT)


Backorders (Online Orders)

Distributors may place backorders for products. Delivery times are subject to change without notice and should be treated as a guide only. If you have any questions regarding products that are not 'in stock' please call our Sales Team on 01264 353123 for more information and advice.

Returns (Online Orders)

In accordance with Mitutoyo customer support services and The Consumer Contracts Regulations 2013 No. 3134, if you should not be satisfied with your purchase within 14 days of receipt, you can return the item for an exchange or refund. The item returned should be in an unmarked ‘as new’ condition, including that of the original ‘product’ presentation/storage packaging or the item will be deemed as being of diminished value and this will be reflected in the. Please ensure that the return carriage packaging provides adequate protection of the item whilst in transit as any damage caused may prevent a refund.

Online returns are only accepted for items purchased directly from If you have purchased a Mitutoyo product from one of our Distributors, please contact them directly to arrange an exchange or refund.

Refunds for returns will include the ‘Standard Next Working Day’ delivery cost if this was incurred upon supply but will not include additional costs for express delivery options.

All deliveries require a signature on receipt. Mitutoyo cannot be held responsible for items lost or damaged whilst in transit.

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