The apparatus for checking the volume of bottles (1) comprises a head (2) adapted to be moved sealingly onto the bottle mouth (21), with a metering piston (7) which is displaceable in relation to the head (2) to be inserted into the bottle (1) and compress the air contained therein, and a pressure sensor...http://www.google.fr/patents/US5319957?utm_source=gb-gplus-shareBrevet US5319957 - Method and apparatus for testing containers
