The vintage Hewlett Packard 400EL AC voltmeter with probe is a reliable and precise tool for measuring AC voltages. This device is designed to provide accurate readings and is equipped with a probe for easy and efficient measurements. Ideal for professionals in the field of electrical testing and measurement, this voltmeter is a must-have for ensuring the quality and safety of electrical systems. Powers on-Works. No power cords, but takes a standard 3 prong.