Search Result for "variometer": 
Wordnet 3.0

NOUN (1)

1. a measuring instrument for measuring variations in a magnetic field;


The Collaborative International Dictionary of English v.0.48:

Variometer \Va`ri*om"e*ter\, n. [L. varius various + -meter.] (Elec.) An instrument for comparing magnetic forces, esp. in the earth's magnetic field. [Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):

variometer n 1: a measuring instrument for measuring variations in a magnetic field