Optimized for differential signal analysis and defects close to tube support plates. From 20.0 mm (0.787 in) and beyond, the probe’s body is made of light, advanced polymer. Under 20 mm, the probes are equipped with stainless steel sleeves. They are particularly well suited to detecting common defects (corrosion, erosion, wear, pitting) and ferromagnetic tubing of feedwater heaters, heat exchangers, and piping.