A manometer is used to test the pressure present in gas pipes. The U gauge manometer is a u shaped glass tube with Liquid in it. Gas is fed into one side of the U and this shifts the sitting position of the liquid to indicate the pressure.
Easy view
30 milibar
Technical specification
Waist Sizeac17cg94gzTypeGaugeToilet Cistern CapacityFTW--Manufacturer Model No11.081Brand NameCity Heating Spares