Consists of panel for wall mounting on which are fitted wall mounting on which are fitted 1.0 to 10Kgcm2 x0.1Kgcm2 a pressure gauge, Bourdon tube 20cm dia. Glass U-tube manometer for measuring low positive pore pressures negative pore pressures and checking zero error of pressure gauge. It is provided with a mercury trap (Mercury supplied at extra cost ) Null indicator made out of clear transport perspex with mercury trap and cursor to indicate the mercury level.