What tool would you use to measure the level of a liquid in a tank?

To measure the level of a liquid in a tank, the most suitable tool is a level gauge. A level gauge is specifically designed to indicate how high or low the liquid sits within a tank, providing accurate readings of the liquid's level. This tool can be mechanical or digital and often uses float mechanisms, ultrasonic sound waves, or radar technology, depending on the design, to determine the liquid level effectively.

In contrast, a flow meter measures the rate at which liquid moves through a pipe, which does not provide information about the liquid’s static level in a tank. A pressure gauge measures the pressure within a tank or system but does not directly indicate the liquid level unless correlating calculations are made. A thermometer measures temperature, which is unrelated to the measurement of liquid level. Therefore, the level gauge is the most accurate and appropriate choice for determining the level of a liquid in a tank.