Wire harness testers evaluate continuity, resistance, isolation, and other performance factors for multi-strand wire harnesses. In selecting wire harness testers, there are a number of specifications that are of importance. One of the first is the number of test points, that is, the number of wires, tracings, or contact points that the device can test simultaneously. Another key criterion is the test resistance – the resistance value or values of the object or objects being tested. Another key consideration is the maximum voltage. This is the voltage that will be applied to each tested circuit. Typically, suppliers provide the maximum voltage.