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  • A Jolt to the Line: HP 400A Voltmeter

A Jolt to the Line: HP 400A Voltmeter

Front face of the HP 400A vacuum tube voltmeter. Enlarge
Photo of the HP 400A vacuum tube voltmeter (front/left). Enlarge
Photo of the HP 400A vacuum tube voltmeter (front/right) with power cord. Enlarge
Photo of the back of the HP 400A vacuum tube voltmeter. Enlarge
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Date: 1942

The 400A vacuum tube voltmeter was Hewlett-Packard’s first voltmeter. Voltmeters would become one of the young company’s most important business avenues.

Tags: 1940s • 1942 • Voltmeter

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