The CHR-6d is a complete 6-axis Inertial Measurement Unit (IMU), with 3-axes of rotation rate measurement, and 3-axes of acceleration Measurement. The CHR-6d features a footprint of only .8" x .7" x .1", and a weight of only 1.5 Grams. -The CHR-6d is a complete 6-axis Inertial Measurement Unit (IMU), with 3-axes of rotation rate measurement, and 3-axes of acceleration Measurement.　The CHR-6d features a footprint of only .8" x .7" x .1", and a weight of only 1.5 Grams.