Digit goniometer is used to measure joint range in the fingers. Using finger, move the measurement head through flexion, extension and hyperextension. This goniometer is also known as a one-hand goniometer because the therapist using only one hand can take readings and can use the other hand to stabilize the patient or record the measurements. The standard finger goniometer requires the therapist to use two hands to make a finger range-of-motion measurement.