Electromyograph (EMG) machines evaluate and record the electrical activity produced by skeletal muscles. Nerve conduction study (NCS) is used to evaluate the function of the motor and sensory nerves of the human body. Evoked potentials (EPs) are the electrical signals produced by the nervous system in response to an external stimulus. Clarity Medical’s Octopus EMG is an EMG/NCS/EP device capable of conducting up to 17 distinct diagnostic tests.