Greisinger gpb 3300 precision digital barometer greisinger gpb 3300 p the greisinger gpb 3300 is a compact and practical digital barometer that can take the precise measurement of atmospheric pressure p p with the height adjustment it is also possible to show the atmospheric pressure at a certain height above sea level the barometer has a pitch of 0 1 mbar which enables it to accurately measure even the smallest pressure fluctuation p p applications measures pressure of air or non