what is difference between pressure gauge and pressure indicator
A gauge is an instrumentation device that is used to directly measure the size of physical quantities whereas an indicator is used to measure small distances and angles, it then amplifies the results to make them obvious. An indicator operates by performing relative measurements against a suitable reference.
an instrument for measuring and recording pressure changes in pneumatic automatic devices and in the cylinders of piston engines. Pressure indicators usually have a sensing element (sensor) and transmitting and recording devices.
