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DeFelsko PosiTest

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Magnetic Coating Thickness Gages for Non-Magnetic Coatings on Steel

PosiTest magnetic pull-off thickness gage (banana gauge) for the non-destructive measurement of non-magnetic coatings (paint, enamel, galvanizing, metalizing, plating, etc.) on steel.

  • Highly wear resistant Carbide Probe for longest life and continuous accuracy
  • Extra rugged housing, not affected by mechanical shock, water, acid or solvents
  • Unique overall design, fully supported, positive positioning, no pivoting tendencies during measurement
  • Positive visual and audible indicators to designate when thickness reading is established
  • V grooves in probe housing and gage base allow correct positioning on cylindrical objects
  • Certificate of Calibration showing traceability to PTB included (Long Form)
Conforms to ASTM D7091/B499, ISO 2808 and others

Accurate

  • Certificate of Calibration showing traceability to PTB included with every gage
  • Matching Calibration Standards and Procedures available for every model
  • Highly wear resistant Carbide Probe for longest life and continuous accuracy
  • Remove center of dial cover for easy calibration adjustment
  • Conforms to national and international standards

Durable

  • Extra rugged housing, not affected by mechanical shock, water, acid or solvents
  • Unique overall design, fully supported, positive positioning, no pivoting tendencies during measurement
  • Can be used fully supported or with only the front probe area contacting the surface
  • Functions on a permanent rare-earth cobalt magnet
  • No batteries/electronics
  • 2 year warranty
  • Easily measures small parts of almost any shape

Simple

  • Positive visual and audible indicators to designate when thickness reading is established
  • V grooves in probe housing and Gage base allow correct positioning on cylindrical objects
  • Compact, lightweight, precisely balanced, independent of gravity – can be used in any position
  • GO/NO-GO button can be pre-set for rapid measurement
  • Probe contact and dial rotation all in a one-finger operation
  • Furnished with wrist strap and instructions in a high quality leather case with belt loops for your convenience

 

PosiTester FM / F / GM / G
FM PosiTest Instrument with FM Scale
F PosiTest Instrument with F Scale
GM PosiTest Instrument with GM Scale
G PosiTest Instrument with G Scale

Available PosiTest models

For: Hot dip galvanizing, hard chrome metalizing, paint, enamel, plastic coatings on steel.
PosiTest FM - Ideal for measuring coating thickness of hot dip galvanizing, hard chrome metalizing, paint, enamel, plastic coatings on steel. (mils)
Scale FM 0-80 mils
Tolerance: +/- 0.2 mils up to 4 mils
+/-  5 percent of the reading
over 4 mils
For: Electroplating, thin paint films,
phosphating on steel.
PosiTest GM - Ideal for measuring coating thickness of electroplating, thin paint films, phosphating on steel. (mils)
Scale GM 0-8 mils
Tolerance: +/-  0.04 mils up to 0.8 mils
+/-  5 percent of the reading
over 0.8 mils
PosiTest F - Ideal for measuring coating thickness of hot dip galvanizing, hard chrome metalizing, paint, enamel, plastic coatings on steel. (microns)
Scale F 0-2000 µm
Tolerance: +/-  5 µm up to 100 µm
+/- 5 percent of the reading
over 100 µm
PosiTest G - Ideal for measuring coating thickness of electroplating, thin paint films, phosphating on steel. (microns)
Scale G 0-200 µm
Tolerance: +/- 1 µm up to 20 µm
+/- 5 percent of the reading
over 20 µm

 

Magnetic Pull-Off

Magnetic pull-off gages use a permanent magnet, a calibrated spring, and a graduated scale. The attraction between the magnet and magnetic steel pulls the two together. As the coating thickness separating the two increases, it becomes easier to pull the magnet away. Coating thickness is determined by measuring this pull-off force. Thinner coatings will have stronger magnetic attraction while thicker films will have comparatively less magnetic attraction. Testing with magnetic gages is sensitive to surface roughness, curvature, substrate thickness, and the make up of the metal alloy.

Magnetic pull-off gages are rugged, simple, inexpensive, portable, and usually do not require any calibration adjustment. They are a good, low-cost alternative in situations where quality goals require only a few readings during production.

Rollback dial models (PosiTest shown in Fig 2) are the most common form of magnetic pull-off gage. A magnet is attached to one end of a pivoting balanced arm and connected to a calibrated hairspring. By rotating the dial with a finger, the spring increases the force on the magnet and pulls it from the surface. These gages are easy to use and have a balanced arm that allows them to work in any position, independent of gravity. They are safe in explosive environments and are commonly used by painting contractors and small powder coating operations. Typical tolerance is + 5 percent.

Coating Thickness Measurement

Fig. 2. Roll-back dial magnetic pull-off thickness gauge.

 

FM
POSITEST FM (0-80 MILS) - COATING THICKNESS GAGE
Mfg. item #: FM
DEFFM
Free 2nd Day AIr for DEFELSCO orders over $599!1047
$327.00

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F
POSITEST F (0-2000 MICRONS) - COATING THICKNESS GAGE
Mfg. item #: F
DEFF
Free 2nd Day AIr for DEFELSCO orders over $599!1047
$327.00

126
GM
POSITEST GM (0-8 MILS) - COATING THICKNESS GAGE
Mfg. item #: GM
DEFGM
Free 2nd Day AIr for DEFELSCO orders over $599!1047
$327.00

126
G
POSITEST G (0-200 MICRONS) - COATING THICKNESS GAGE
Mfg. item #: G
DEFG
Free 2nd Day AIr for DEFELSCO orders over $599!1047
$327.00

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