Greisinger digital manometer including sensor gmh 3181 xx series greisinger gmh 3181 01 the greisinger gmh 3181 01 is a digital manometer including sensor for measuring the overunder pressure and pressure difference 100 to 2500 pa or plusmn2500 pa the remarkable zero point stability as well as two measurement ranges ensures that you will always have the optimal measurements by automatically switching between measurement rangesthis handy and sturdy pressure instrument with integrated