Device for measuring the gas-permeability of at least one cork, in particular a bottle or jar cork, comprising - a measuring cell in which the cork(s) can be mounted so as to delimit a chamber upstream of the cork and a chamber downstream of the cork, wherein gases can only be exchanged between the upstream chamber and the downstream chamber by passing through the cork(s), - a gas supply allowing an upstream pressure of a first gas with a first predefined pressure value to be imposed in the upstream chamber, - a downstream pumping device allowing an initial reduced pressure of a second predefined value, lower than the first value, to be imposed in the downstream chamber, then isolating the downstream chamber from gas exchanges other than those passing through the cork, - a pressure sensor connected to the downstream chamber, wherein the downstream chamber is configured to define, in the presence of the cork, a first volume with a value of an actual volume of the downstream chamber which remains constant when the internal pressure of the downstream chamber varies between the applied pressure and the initial reduced pressure, wherein the actual volume of the downstream chamber has as a lower limit, a minimal volume of the downstream chamber depending on the insertion positions of different corks, characterized in that the downstream chamber is connected via a first valve to a metering chamber also of constant volume, wherein the metering chamber is arranged such that when the first valve is closed, it can be successively connected to and isolated from the atmosphere or a gas supply, wherein the volume of the metering chamber lies between 0.5 and 10 times the minimal volume of the downstream chamber, and in that the device also comprises a control unit configured to evaluate, for each new measurement of permeability of a cork, the actual volume of the downstream chamber in the presence of this cork by comparing the actual volume of the downstream chamber with the volume of the metering chamber. - a measuring cell in which the cork(s) can be mounted so as to delimit a chamber upstream of the cork and a chamber downstream of the cork, wherein gases can only be exchanged between the upstream chamber and the downstream chamber by passing through the cork(s), - a gas supply allowing an upstream pressure of a first gas with a first predefined pressure value to be imposed in the upstream chamber, - a downstream pumping device allowing an initial reduced pressure of a second predefined value, lower than the first value, to be imposed in the downstream chamber, then isolating the downstream chamber from gas exchanges other than those passing through the cork, - a pressure sensor connected to the downstream chamber, wherein the downstream chamber is configured to define, in the presence of the cork, a first volume with a value of an actual volume of the downstream chamber which remains constant when the internal pressure of the downstream chamber varies between the applied pressure and the initial reduced pressure, wherein the actual volume of the downstream chamber has as a lower limit, a minimal volume of the downstream chamber depending on the insertion positions of different corks,