crossed-needle meter

crossed-needle meter

[′krȯst ¦nēd·əl ′mēd·ər]
(engineering)
A device consisting of two pointer-type analog meters inside a single enclosure with pointer movements centered at different positions so that their point of crossing indicates the value of some function of the two readings.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.