Measuring and recording 3-axis linear acceleration and 3-axis roll, pitch, and yaw is easier with the MotionMaster EDR-6DOF self-contained sensor and recorder. The compact data unit from Instrumented Sensor Technology Inc., Okemos, Mich. (isthq.com), features built-in angular rate sensors for monitoring rotational movement about three axes and three built-in linear accelerometers (or one tri-axial accelerometer) to track linear movement along the same three axes.