A 0.28-inch voltmeter refers to the size of the display or dial of a voltmeter. The measurement indicates the diameter of the display in inches.
These meters are used to measure electrical potential difference, also known as voltage, in a circuit. They typically have a dial or digital display that shows the voltage reading. The size of the display can vary, and the 0.28-inch measurement refers to the diameter of the display.
It’s worth noting that the size of the display does not necessarily reflect the accuracy or capabilities of the voltmeter. The accuracy and range of measurement are determined by the internal components and specifications of the voltmeter itself.