Electrogoniometers and Torsiometers
Twin-axis Electrogoniometers (SG series) simultaneously measure angles in up to two planes of movement. For example, to measure wrist movements, the endblocks of the Electrogoniometer are attached on the dorsal surface using double sided tape (T10), one end over the third metacarpal, the other over the midline of the forearm, with the wrist in the neutral position.
The Electrogoniometer has two separate output connectors, one measures flexion/extension, the other radial/ulnar deviation. When used to measure a single-axis joint such as the knee or elbow, or when measuring a single plane of a twin-axis joint, simply connect one channel, the other remains redundant. All twin-axis Electrogoniometers function the same way, the difference being physical size.
Biometrics' single-axis Electrogoniometer (F35) measures angles in one plane only. This smallest goniometer is designed to measure flexion/extension of finger or toe joints.
Biometrics Ltd single-axis Torsiometers (Q series) are designed for measurement of rotations in one plane e.g. forearm pronation/supination or neck axial rotation. If the Torsiometer is bent in planes X-X or Y-Y the output remains constant. All Torsiometers function in the same way, the difference being physical size.