SR300 Surface Roughness Tester 21000

The Starrett SR300 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. 17.5mm travel, 200um range, 10nm resolution, Standard Parameter Set (ISO 4287, ASME, JIS)

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  • 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


  • 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