Portable Coating and Paint Thickness Gauge. For use on Ferrous OR Non Ferrous materials. Specifications for PT 220 and 230: The PT220 is an advanced integrated coating and film thickness gauge distinguished by its very compact size, high accuracy, wide measuring range and simplicity of operation. It combines a ferrous F-probe and a data processor in a single unit, automatically computes the thickness of a non-magnetic coating (aluminum, chrome, copper, enamel, rubber, paint) on a ferrous substrate (steel, iron, alloy, and magnetic steel) by utilizing the properties of magnetic induction. The PT230 combines a non-ferrous N-probe and a data processor in a robust single unit. It is also very compact, highly accurate, has a wide measuring range and is easy to operate. It automatically computes the thickness of insulating coatings (enamel, rubber, paint, plastic, etc.) on a non-ferrous substrate (copper, aluminum, zinc, tin, etc.) by utilizing the properties of eddy current. » PT220 magnetic induction measuring principle » PT230 eddy current measuring principle » Measuring modes: Single/continuous » Memory modes: Direct/batch » Onboard memory: 15 » Automatic calculation: Mean/Max/Min/No./S.DEV » Error detect ability: Buzz & display » Micro printer can be added » Automatic shut-off » Operating temperature: 32ºF-113ºF(0ºC-45ºC) » Power source: 2x3.6 V(NiMH batteries) » Weight: 0.26 lb (120g) » Dimensions: 150 x 53 x 22 mm » Compact carrying case