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A vacuum tube voltmeter (VTVM) is just the "old school" version of the newer (cheaper, more accurate and easier to use) digital multimeter (DMM). It is used to measure voltage (AC and DC), resistance, and (usually) current flow. It may have some other functions. For the most part, these meters (the VTVMs) used an electromechanical meter movement (expensive, shock sensitive, sometimes hard t read/interpret) in place of the display of the DMM. And they have some disadvantages over the DMM, as mentioned here and there. (There are a couple of things the old VTVM will do that the DMM has difficulty doing, but the modern DMM is a better meter for almost any application.) The need to make measurements, and, hence, the need for the meter is to support understanding and assessment of electrical "stuff" that needs to be looked at, usually to see why it isn't working properly. The meters are used by builders of electronic and electrical devices, and by the curious who wish to investigate the physics of basic electronics and electricity.

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