“Lab Meter” is a general term that could refer to various types of measuring instruments used in laboratory settings, such as ammeters, voltmeters, or multimeters.
A round meter typically refers to an analog meter that has a circular display with a needle that moves across a scale to indicate the measurement being taken. The scale may be marked with units of measurement such as volts, amperes, or ohms, depending on the type of meter.
In the context of a lab meter with a round display, the instrument could be any type of analog meter that has a circular shape. The specific function of the meter and the units of measurement it displays would depend on the type of meter and its intended use.