Greisinger gdh 14 an digital manometer pressure measuring instruments greisinger gdh 14 an p the greisinger gdh 14 an is a digital manometer used for taking control measurements in laboratories industry education and research the sensor is suitable for air and non corrosive non ionising gases and liquids p p the manometer is ideal for over under and differential pressure measurements and is supplied ready for use including sensor plug in battery with analogue output 0 1v p