Greisinger gdh 200 13 robust digital manometer greisinger gdh 200 13 p the greisinger gdh 200 13 is a small robust digital manometer that offers straightforward hand held pressure testing the gdh 200 13 is fitted with an attachment for the measurement pressure hose internal diameter 4mm for measuring over under pressure and pressure difference up to 2000mbar p p the remarkable zero point stability as well as two measurement ranges makes sure you always have the optimal measurements by