The Which-Ender™ is a capacitance detection probe. By sensing capacitance it identifies if a wire is connected to a contact. When you press the Which Ender's button, a tone is produced. If a contact has a wire connected this tone will drop in pitch when the probe tip touches the contact.

The Which Ender™ is indispensable for locating opens, breaks, and unused pins in a cable at the connectors. For detecting shorts, miswires, and other errors use one of our cable analyzers.