10 Best Surface Roughness Gauges 2025

As a surface roughness gauge expert, I've reviewed and scored many products in the surface and hardness testing category. From a 7.3 to an impressive 9.7 score, there's a product for every need. But if you're looking for the top performer, let me introduce you to the Mitutoyo 178-390 Standard Detector for Surftest SJ-201 and SJ-301. This 6.75" inside depth gauge from Mitutoyo is the cream of the crop in the surface roughness gauges subcategory. With its advanced technology and precision engineering, this gauge will leave you with unparalleled results. Don't hesitate, take your surface and hardness testing to the next level with the Mitutoyo 178-390.