The goniometer is a two-piece ruler that is jointed in the middle with a protractor-type measuring device that is placed over a joint as the individual extends or flexes the joint to measure the degrees of flexion and extension on the protractor (C). A doppler is used to measure blood flow (A). Calipers are used to measure body fat (B). A tape measure is used to measure circumference of body parts (D).Correct Answer: C