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Home  >>  Products  >>  Surface Profile  >>  Surface Profile Portable Comparator Kit

Surface Profile Portable Comparator Kit


The Keane Tator Surface Profile Comparator is a field instrument designed to quickly and accurately determine the surface profile of blast cleaned surfaces. The comparators are available for grit blast, shot blast or sand blast, and comparisons can be made visually or by touch. This method is ideal for providing a very quick evaluation of the surface preparation.

It is compact, portable, and has extremely durable reference discs for surface profile determinations.

Surface Profile Portable Comparator Kit



A comparator unit consists of a reference disc, a 5-X illuminated magnifier with magnetic disc holder and a plastic disc case. A different disc is available for use on sand, shot or grit blast cleaned surfaces. Each disc is a high purity nickel electro-formed copy of a master disc duplicated to within plus or minus 50 microinches. Blast cleaned surface is compared with the reference disc through illuminated magnifier.

The comparator disc is composed of five sections, each with a different anchor pattern depth. Each section is marked first giving the nominal anchor pattern depth in mils (one mil = 25.4 microns); next a “G/S” indicating a grit/ steel (metallic grit) abrasive and a “76” indicating the year the master disc was made.

Surface Profile Comparator Reference Discs

Technical Data

  • Reference Disc - The Keane-Tator grit/steel comparator has as its basic component a high purity nickel reference disc comprised of five segments with nominal anchor patterns of 1.5, 2.0, 3.0, 4.5 and 5.5 mils. (One mil = 25.4 microns.) The reference disc is an electroformed copy of a master disc, duplicated to a maximum tolerance of ±.05 mils. The master disc segments were selected from carbon steel plates blast cleaned with a variety of metallic grit operating mixes (G 14 to G 80) at different distances and angles from the source. Segments of the master disc and the electroform copy were measured in the Steel Structures Painting Council Laboratory at the Mellon Institute of Carnegie Mellon University, Pittsburgh, Pennsylvania.

  • Anchor Pattern Measurement - The profile was obtained by focusing a calibrated optical microscope first on the highest peak and then the lowest valley in the field of view, noting the movement distance were made at 250X (18 mil field diameter) and 100X (45 mil field diameter). Measurements at higher magnifications are preferred when “fine” profiles are being measured because of greater precision due to lesser depth of field. Measurement of “coarse” profiles is done at lower magnification to include more peaks. Because of the larger field of view at 100X, the statistical probability of a larger peak being measured at 100X versus 250X is slightly greater than six times. Information regarding the “average maximum profile” (h max) of each segment of the reference disc is provided in the accompanying graphs. Reference: J.D. Keane, J.A. Bruno, Raymond E.F. Weaver; SURFACE PROFILE FOR ANTI-CORROSION PAINTS; October 25, 1976 by Steel Structures Painting Council.

Instructions for Use

Determine the profile of metallic grit blast cleaned steel by choosing the reference disc segment that most closely approaches the roughness of the blast. Note that roughness may lie between two segments and be designated, for example 2.5 G/S 76.

Visual Reference Without Magnification - Hold the disc directly against the surface and make visual comparisons.

Visual Reference With Magnification - Attach the disc to the magnetic ring on the bottom of the magnifier and hold the entire unit directly on the surface. Either center the disc and make evaluations through the hole or offset it slightly and compare the steel in the “V” notches separating segments. The magnifier can be used with its internal light source or by shining an external light through the slot in the magnifier head. This method may highlight peaks and make comparisons easier.

Tactile Reference - Compare the roughness of the blast and the reference disc segments using a soft wooden stylus or fingertip.

Blast Disc Chart

Surface Profile Comparator Disc Chart



Prices subject to change    Prices listed in US dollars for domestic shipments within US    For tax exempt orders please call us at 954-946-9454
Item Number Item Prices

One reference disc in case, Directions for use, Special magnetic illuminated magnifier

SU-K-372/1S Surface Profile Comparator Kit with Sand Blast Disc
SU-K-372/1G Surface Profile Comparator Kit with Grit Blast Disc
SU-K-372/1SH Surface Profile Comparator Kit with Shot Blast Disc
Kit with All 3 Discs
SU-K-372/3 Surface Profile Comparator Kit with All Three Discs
SU-K-372/* Disc & Case only - Specify Sand, Grit or Shot Blast Disc 177.45
SU-K-372/IL Illuminated Magnifier Only 66.15


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