Om Electronics offers Proving Rings with Low Profiles. Om Electronics supplies Tachometers, pH meters, Conductivity meters, Function Generator, Output Power meters, High Voltage Breakdown Tester, Resistance Meters, Temperature Calibrators, Luxmeters, Humidity Meters, Temperature Indicators etc. The Proving Rings with Low Profiles are designed for specific applications requiring high capacities with low profiles. They are particularly well -suited for the calibration of concrete testing machines and other types of testing machines with limited daylight openings. The Proving Rings with Low Profiles are also lighter in weight than comparable capacities in larger diameter rings resulting in easier handling.