As the picture shows, the gear is narrow and deep, which makes the measurement very difficult for normal roughness testers. But our TIME3231 roughness tester, equipped with a skidless oblique probe, can easily test its roughness from the bottom.
TIME3231 Measures Narrow Gear from the Bottom
TIME323X Profilometers perfectly measure the profile
TIME3221 Roughness Tester Checking Subway Wheels