It is standard Manometer used for precision measurement of Pressure, Differential Pressure for flow measurement in plants

Zero adjustment scale
Wall mounted or stand mounted
Also available in Acrylic Body
Ranges
For Glass Tube :
250 - 0 - 250 mm 500 - 0 - 500 mm
750 - 0 - 750 mm 1000 - 0 - 1000 mm

For Acrylic Body :
50 - 0 - 50 mm 100 - 0 - 100 mm
150 - 0 - 150 mm 200 - 0 - 200 mm