The Baseline Bubble Inclinometers are used to measure range-of-motion (ROM). The Baseline Bubble Inclinometer precisely measures, tests and evaluates the range-of-motion of necks, hips, spines, elbows, knees, shoulders, ankles, wrists and MCP joints. To use, place the Inclinometer near the joint to be measured. As the joint gets manipulated, the range-of-motion displays (in degrees) directly on the dial.