Greisinger gdh 200 07 digital fine manometer greisinger gdh 200 07 p the greisinger gdh 200 07 is a digital fine manometer that is a durable pressure measurement instrument that offers straightforward hand held pressure testing the gdh 200 07 is fitted with an attachment for the measurement pressure hose internal diameter 4mm for the measuring over under pressure and pressure difference up to 200mbar p p the remarkable zero point stability as well as two measurement ranges makes sure