What is the name of the following instrument

To differentiate peripheral nerve stimulator and locator see the current given,Generally peripheral nerve stimulator:30-50mA Peripheral nerve locator:0.5-5mA peripheral nerve stimulator is used to see whether the effect of muscle relaxant gone off or not before patient wake up from anesthesia.Most commonly stimulated nerve is Ulnar nerve. . Peripheral nerve locator is used to find the nerve in regional block This is a transcutaneous electric nerve stimulator(TENS) used for chronic pain