Based on this product's specifications, here are some alternatives and similar models
Paint Thickness Gauge No name P-13-FE, model 1461, for ferrous metals
Summary description:
Paint thickness gauge No name P-13-FE (model 1461) is a handheld instrument for measuring coating thickness on ferrous (iron/steel) substrates. It provides quick nondestructive readings to assess paint, lacquer or plating thickness for inspection, quality control, vehicle surveys and repair preparation. Intended for practical on-site use where ferrous-only measurements are required.