Abstract: A method and apparatus for proving and calibrating meters used to measure the amount of cryogen dispensed from a storage receptacle. The apparatus can be lightweight and portable for verifying meters in the field and it is possible with the apparatus to prove or calibrate both volumetric and mass flow type cryogenic meters. The apparatus is further characterized by providing for simultaneously using the meter under test to record the amount dispensed and using the test apparatus to measure the temperature, pressure, volume, flow rate, and time to prove the meter under test by physical determination of the amount of product dispensed. Furthermore, the apparatus of the present invention can serve as a Cryogenic Liquid Meter Transfer Standard which meets the National Bureau of Standards specifications for such devices.