Mass Flow Meters are instruments used to measure the mass flow rate of a fluid directly. Unlike volumetric flow meters, which measure the volume of fluid passing through, mass flow meters provide a more accurate measurement by accounting for variations in fluid density.

These devices measure the level of a substance (liquid or solid) in a container and transmit the data for monitoring or control purposes. Examples include ultrasonic level transmitters and radar level transmitters. Level Switches: Used to detect the presence or absence of a material at a certain level. Float switches and capacitance level switches are common examples.