Which measurement can be taken using a digital surface profile gauge?

A digital surface profile gauge is a specialized instrument specifically designed to measure the depth of surface profiles, which is crucial when assessing the texture of a substrate before applying coatings. The depth of surface profile is a vital factor in ensuring good coating adhesion, as it influences how well coatings adhere to the surface. This measurement usually involves taking readings from the peaks and valleys of the surface to provide a precise quantitative value of the texture.

In contrast, while temperature, moisture content, and soluble salt concentration are important factors in the coating process, they require different specialized instruments for accurate measurement. Temperature can be measured with infrared thermometers or thermocouples, moisture content is typically assessed using hygrometers or moisture meters, and soluble salt concentration is often evaluated through chemical testing methods or ion chromatography. Each of these measurements addresses critical environmental conditions that can affect coating performance but is outside the capabilities of a digital surface profile gauge.