Invo Spline is a major supplier of precision spline gages and master gears, serving manufacturers of aircraft, automotive, farm, and earth-moving equipment since the early 1950s. They offer a range of products including precision spline gages, quick check spline gages, indicating type gages, and external gear rolling fixtures. Invo Spline is well-respected in the industry and has industry-leading expertise recognized by various organizations. Their products include GO or NO GO solid-type spline gages for internal and external checking, indicator type rings, and plug gages for measuring tooth profiles with high precision.