an instrument for measuring magnetic flux, consisting essentially of a ballistic galvanometer.
Origin of fluxmeter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
any instrument for measuring magnetic flux, usually by measuring the charge that flows through a coil when the flux changes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012