Surface Gauges and Testers arrow Starrett Surface Roughness Tester

Surface Roughness Tester

Part#: SR Series
Supplier: Starrett
Calibration Certificate: is available at extra cost
Photo Gallery - click any photo to enlarge

The Starrett SR Series Surface Roughness Tester is a full-featured, powerful and versatile surface roughness tester. It can be used either freestanding or bench mounted with fixturing for batch measurement and laboratory applications. Display & Traverse unit; Pick-up & Diamond Stylus; Calibration Std; Manual; and Case. 25mm travel, 360um range, 5nm resolution, Advanced Parameter Set (ISO 4287, ISO 13565, ASME, JIS).


 starrett sr300 roughness usb starrett sr300 roughness profile
starrett sr300 roughness surface

USB Connectivity
Through its industry standard Type A USB port and mini USB port the SR series instruments provide extensive connectivity options to many standard devices.

Profile graph
Detailed graph shows measured area to help identify problem areas

Any surface, any height
Even the most challenging surfaces can be measured without the need for expensive riser blocks, stands or fixtures. The stylus can even measure upside down!

The inclusion of a 50mm stylus lift with rightangle attachment and more than 70mm stylus reach. The anti-slip V-feet also mean the system can be used on flat or curved surfaces.

  • Simple set up
    Shortcuts provided for all the key settings to give instant access with just a single touch
  • USB mini
    for charging (with any standard USB charger) and / or connection to a PC for data transfer
  • USB type A
    attach a portable printer or USB storage device
  • Orientation
    Fix the display in 1 of 4 orientations perfect for awkward measurements
  • Lift/lower
    Supplied as standard providing 50 mm height adjustment, right angle measurement and 70 mm reach into bores
  • Anti-slip feet
    Perfect for mounting on flat or curved surfaces. V design aligns measurement with cylinder axis
  • Comfort grip
    Sits comfortably in the hand when reviewing results or changing settings
  • Rubberized moulding
    Added protection and better grip in the hand invaluable in shop floor environments
  • Large screen display
  • Unique stylus lift mechanism for total flexibility
  • Many application specific parameter options
  • Comprehensive selection optional accessories and pickups
  • Long traverse length and extended pickup reach
  • Stores of up to 100 readings

Starrett SR300 - SR400 Video presentation

Advanced surface finish analysis software

starrett sr300 softwareTalyprofile is a dedicated PC based software package designed for use with the SR300 and SR400 series instruments. Three versions are available. Talyprofile “Lite” has all functions typically used for a shopfloor inspection, Talyprofile “Silver“ has enhanced features for R&W parameters, a statistics module and full report printing and Talyprofile “Gold“ has complete laboratory analysis functions:

  • Outstanding graphics
  • Advanced time-saving analysis templates
  • Desktop publishing facility
  • In depth analysis
  • Full compatibility

Talyprofile parameters

  • Roughness parameters obtained by filtering: Ra, Rq, Rt, Rp, Ry, Rku, Rsk,RSm, Rz, RΔq, RTp, RHTp, Rlo, RΔq, RPC, RzJIS, R3z.
  • Parameters on the raw profile (unfiltered): Pa, Pq, Pt, Pp, Pv, Pku, Psk, PSm, Pz, PΔq, PΔq, PTp, PHTp, PLo, PPc.
  • Parameters obtained by double filtering (DIN 4776): Rk, Rpk, Rvk, MR1, MR2, A1, A2, Rpk, Rvk
  • Parameters obtained by the motifs method (“R&W”)*: R, AR, Pt, Rx,
    SR, SAR, Nr, Kr, W, AW, Wte, Wx, SW, SAW, Nw, Kw, Rke, Rpke, Rvke, Trc, HTrc.
    *Only with gold or silver versions


  • Accuracy (in): 2% of reading + LSD µm
  • Cutoff Lengths: 0.01, 0.03, 0.3" / 0.25, 0.8, 2.5, 8mm
  • Filter: 2CR or gaussian (selectable)
  • Measuring Range: 200/100/10µm
  • Pick-up Stylus: Inductive
  • Roughness Parameter: Ra, Rz, Rt, Rp, Rmr, Rpc, Rsm, Rz1max, Rsk, Rda
  • Tracer Tip: Diamond stylus Tip radius 200µ" / 5µm unless otherwise specified
  • Tracing Length: 0.01-0.49" / 0.25-12.5mm
  • Tracing Speed: 0.04"/sec, 1mm/sec
  • SPC / stats
    • Advanced (Starrett SR400): Min, Max, Mean, StdDev of stored results, ASCII export of all results for SPC via USB (optional features for Starrett SR300 model)
Surface Roughness Tester Technical specs Starrett SR300 Starrett SR400
Languages Basic English, French, German, Italian, Spanish
Data Output On-screen up to 7 results per page, selectable on-screen graph with XZ axis
  Printer Output settings, results and high resolution profile graph
  PC Connection Full data analysis with Talyprofile
Data storage Internal 100 measurement results, 1 raw profile
  USB (4GB supplied) >39,000 raw profiles, up to 100,000 results per batch (>70 batches)
  PC connection Unlimited data storage
SPC / stats Internal Optional Min, Max, Mean, StdDev of stored results
  USB (4GB supplied) Optional ASCII export of all results for SPC
  PC connection full SPC and tolerancing of all parameters using Talyprofile software
Battery Charger USB 5v 1A 110-240VAC 50/60Hz
  Charging time 4 hours
  Battery life 2000 measurements
  Standby time 5000 hours
  InstantOn max 1 sec from standby to ready to measure
  Auto sleep function 30 sec - 6 hours

starrett SR300, SR400: specifications

Need to have this new Starrett SR Series Surface Roughness Tester calibrated? While this gauge has passed a quality control check, having a calibration certificate for surface gauges and testers might be required by your quality control system. Digital Measurement Metrology (owner of is a canadian metrology company with more than 25 years of experience. Our Brampton, Ontario based calibration lab has one of the most comprehensive ISO 17025 accredited calibration scope in Canada.

Do you have an old Starrett gauge to be calibrated? We might be able to calibrate Starrett surface gauges and testers (Starrett SR Series or a different model) and provide an ISO, NIST traceable calibration certificate. Please contact our metrology lab for more info.

Ordering info

SKUDescription SPC/stats IP RatingIn Stock
SR300Standard SR Roughness Tester Standard None 0
SR400Advanced SR Roughness Tester Advanced IP43 0

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