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Positector-SPGPositector SPG - Surface Profile Gauge

The PosiTector SPG Surface Profile gauges measure and record peak to valley surface profile heights. A durable Alumina wear plate and tungsten carbide needle probe replaces the dial gauge specified in the Australian standard allowing quick data logging of the surface profile of blasted steel or textured coatings. 

The Surface Profile gauge is on of the standard probes include with a PosiTector Inspection Kit.

Conforms to AS 3894.5-C (with optional 30° tip angle), ASTM D4417-B, SSPC-PA17, U.S. Navy NSI 009-32, SANS 5772 and others.


Surface profile gauges are used to record the surface profiles on blasted or otherwise prepared metals before coatings are applied. The PosiTector uses method C - Needle-Type Depth Micrometre from the Australian Standard AS 3894.5-C.

A depth measuring probe with a 30 degree angle needle, tip radius 20 μm is set to a zero from an undamaged plate glass surface. Multiple measurements are taken, low readings discarded and the mean used as one test area. The average profile height is then recorded. 

How to select your probes

For testing blasted steel or other metal an SPG or SPG S along with an accessory 30 degree tip probe is suitable for testing in Australia, an SPG OS is useful for testing over convex surfaces with the same 30 degree tip. The SPG CS probe has a greater measuring range but is suitable only for measuring textured coatings.



Standard Gauge Features

  • Hi Contrast reversible colour LCD
  • Storage of 250 readings—stored readings can be viewed or downloaded


  • Fast measurement rate of over 50 readings per minute - ideal for quickly and accurately measuring surface profile over large, flat surface areas
  • Enhanced one-handed menu navigation
  • RESET feature instantly restores factory settings


  • Alumina wear face and tungsten carbide tip for long life and continuous accuracy – field replaceable
  • Solvent, acid, oil, water and dust resistant – weatherproof
  • Rugged, outdoor/indoor instrument - ideal for field or shop use
  • Shock-absorbing, protective rubber holster with belt clip and wrist strap
  • Two (2) year warranty on body and probe


  • Built-in temperature compensation ensures measurement accuracy
  • Long form Certificate of Calibration showing traceability to PTB included
  • Glass Zero Plate and metal check shim included
  • Conforms to national and international standards including ASTM D4417 Method B and SSPC-PA17


  • PosiTector body accepts all PosiTector 6000, 200, DPM, UTG, RTR and SPG probes easily converting from a coating thickness gauge to a dew point meter, surface profile gauge or wall thickness gauge. View Video
  • 30º angle interchangeable probe tip available for special surface profile applications
  • Selectable display languages
  • Hi Contrast backlit display for bright or dark environments
  • Flip display enables right-side-up viewing
  • Uses alkaline or rechargeable batteries (built-in charger)


  • Continually displays/updates average, standard deviation, min/max thickness and number of surface profile readings
  • HiLo alarm audibly and visibly alerts when measurements exceed user-specified limits
  • Every stored measurement is date and time stamped
  • Screen Capture - record and save image into USB flash memory for record keeping and review
  • USB port for fast, simple connection to a PC and to supply continuous power. USB cable included
  • PosiSoft solutions for viewing, analysing & reporting data:
  • PosiSoft USB Drive - stored readings and graphs can be accessed using universal PC/ Mac web browsers or file explorers. No software required
  • account - a free web-based application offering secure storage of thickness readings
  • PosiSoft Desktop software (PC/Mac) for downloading, viewing, printing and storing measurement data. Available as a free download.
  • PosiSoft Mobile - (Advanced models only) - access readings, graphs, capture photos and update notations through WiFi enabled devices such as tablets, smart phones and computers
  • Software updates via web keep your gauge current

Additional features on advanced models

Includes all features shown above and in addition: 

  • Hi Contrast reversible colour LCD
  • Storage of 100,000 readings in up to 1,000 batches and sub-batches—stored readings can be viewed or downloaded
  • SmartBatch™ allows entry of user-defined parameters and criteria to comply with various standards and test methods
  • WiFi technology - wirelessly synchronizes with, downloads software updates and connects to mobile devices for expanded functionality
  • Bluetooth Wireless Technology for data transfer to a computer or optional portable printer
  • Real time graphing, picture prompting and batch notes
  • Compare Standard and Advanced: PosiTector Body Comparison Chart

SPG Complete KitSystems Include

ALL GAUGES COME COMPLETE with glass zero plate, metal check shim, protective rubber holster with belt clip, wrist strap, 3 AAA alkaline batteries, instructions, nylon carrying case with shoulder strap, protective lens shield, Long Form Certificate of Calibration traceable to PTB, USB cable, two (2) year warranty.

SIZE: 137 x 61 x 28 mm (5.4" x 2.4" x 1.1")

WEIGHT: 140 g (4.9 oz.) without batteries

CONFORMS TO: AS 3894.5-C (with optional 30° tip angle), ASTM D4417-B, U.S. Navy NSI 009-32, SANS 5772 and others

Accessories available: 

  • Non-Certified Metal Shim & Glass Zero Plate
    • Provides a quick accuracy check of the instrument
    • Allows the user to perform practice measurements
    • Consists of a 76 μm (3 mil) check shim and a glass zero plate
    • Labelled in both Metric and Imperial units
    • A metal shim and glass zero plate are included with every PosiTector SPG
  • Certified SPG Standards
    • Used to verify the accuracy and operation of surface profile depth micrometres
    • Ideal for use in calibration labs
    • Standards consist of 4 sapphire test plates mounted in a precision ground steel base and supplied in a hard shell case
    • Sapphire test plates are individually serialized for traceability to PTB-includes a Certificate of Calibration
    • Certified and labelled in both Metric and Imperial units
  • Replacement Tungsten Carbide Probe Tips
    • 2 angles available: 60° or 30°
    • Includes replacement tool

Other Resources



Western Australia

T: (08) 9322 4020 

Derek Burns


M: 0498 800 373


New South Wales

William Ward


T: (02) 9986 1857

M: 0418 381 709 

Joel Shenoy


M: 0487 043 466



T: (03) 9938 3830

Melanie Lasslett


M: 0428 315 502

Monica Simhadri


M: 0488 331 244



Michael Dubery


T: (07) 3040 6166

M: 0419 477 715


Auckland, New Zealand


E: This email address is being protected from spambots. You need JavaScript enabled to view it.

M: +64 274 738758

T: +64 9 377 6778


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