permeameter

[ pur-mee-uh-mee-ter, pur-mee-am-i-ter ]
/ ˈpɜr mi əˌmi tər, ˌpɜr miˈæm ɪ tər /

noun

an instrument for measuring magnetic permeability.

Origin of permeameter

First recorded in 1885–90; permea(bility) + -meter