The PosiTest DFT comes in two models — DFT Ferrous, which measures nonmagnetic coatings on steel, and DFT Combo, which measures those, plus nonconductive coatings on materials such as aluminum and brass. The Combo automatically identifies the substrate as it takes a measurement.

Both models are 4 inches long and feature fast, repeatable measurements, no calibration required for most applications, a ZERO feature for rough or curved surfaces, a RESET feature when no zero reference is available, a wear-resistant ruby-tipped probe, audible and visible measurement indication, and switchability between mils and microns. The device measures 0 to 40 mils.

The PosiTest DFT is manufactured by DeFelsko Corp., which can be reached on the DeFelsko Web stie or cal (800) 448-3835. To contact one distributor of the device, reach Paul N. Gardner Co. Inc. at the Gardner Co. Web site or (800) 762-2478.