ball-float liquid-level meter

ball-float liquid-level meter

[′bȯl ‚flōt ¦lik·wəd ¦lev·əl ‚mēd·ər]
(engineering)
A float which rises and falls with liquid level, actuating a pointer adjacent to a calibrated scale in order to measure the level of a liquid in a tank or other container.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.