McLeod gauge

noun Physical Chemistry.
  1. a device for determining very low gas pressures by manometrically measuring the pressure of a sample after its compression to a known fraction of its original volume.

Origin of McLeod gauge

named after Herbert McLeod (1841–1932), English chemist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018