The Vintage Hewlett Packard 415B Vacuum Tube Voltmeter is a classic piece of equipment from HP, known for its durability and accuracy in measuring voltages. This untested unit does not come with any guarantees but is a valuable collector's item for those interested in vintage test meters and detectors. The fact that it powers up indicates that it may still be functional, making it a unique addition to any business or industrial setting. It's been untested but does fire up.