⭕ Cadwell Sierra EMG/NCV/EP in perfect condition. Equipment is less than 2 years old. If not happy with the purchase, returns are accepted within 30 Days. Local pick-up or shipping can be arranged. Works as it should, tested, serviced and well maintained. This is a complete solid system, ready to go. The 4-channel amp to also to do evoke potentials. Cadwell Sierra is the most reliable and easy machine at all times to do both NCS/EMG and EP. The 4 channel amplifier give you the capability to do evoke potentials. Owners manuals included.