Unique probe modules allow the Elcometer 355 Coating Thickness Gauges to be versatile and flexible for any measurement application. Probe modules can be freely interchanged as required for both ferrous (F) and non-ferrous (N) metal substrates. Most probe modules are capable of an accuracy of ±1% of the reading on a variety of coatings and surfaces. Telescopic probes extend from 410mm (16”) to 1100mm (43”).