The Portable Dry Film Thickness Gauge segmentation by type distinguishes three principal technologies: magnetic, ultrasonic, and eddy‑current gauges. Magnetic gauges, which rely on the variation of magnetic flux density across a coated substrate, dominate the market due to their low cost and robustness in non‑ferrous metal applications, contributing roughly 45 % of total sales. Ultrasonic gauges employ high‑frequency sound waves to measure coating thickness on both conductive and non‑conductive surfaces; their ability to penetrate thicker layers and provide real‑time data secures about 35 % of the market, especially in aerospace and heavy‑industry contexts. Eddy‑current gauges, based on electromagnetic induction, are preferred for precision measurement on conductive substrates, capturing the remaining 20 % of revenue. Each technology’s distinct measurement principle, material compatibility, and price point shape its share, collectively defining the overall market size for portable dry film thickness gauges.