What tool is used to measure oil pressure in an oil burner?

The tool used to measure oil pressure in an oil burner is a manometer or pressure gauge, which is correct. A manometer is designed specifically for measuring gas or liquid pressures, making it an ideal choice for assessing the oil pressure within an oil burner system. Accurate measurement of oil pressure is crucial because it ensures that the burner operates efficiently, providing the right amount of fuel to maintain combustion and heat output.

In contrast, a thermometer measures temperature, which does not provide information about pressure. A voltmeter is used to measure electrical voltage, which is not relevant to measuring oil pressure. A pyrometer is used to measure high temperatures, typically in gas flames or hot environments, and is not applicable for checking oil pressure either. Thus, using a manometer or pressure gauge is essential for maintaining the proper functioning of an oil burner system.