Pyrex* Vacuum Mercury Manometers

The manometer tube is enclosed in a round bottom, graduated jacket and is sealed to a stopcock plug. In use mercury is placed in the inner tube and in the jacket bottom to measure the pressure differential. Not recommended for positive pressure. The legible, red scale ranges from 0 to 160 mm. Mercury filling instructions are supplied with each instrument. Uses 5 to 6 ml mercury. Mercury not supplied. 988-26434 comes with "T"� connection and two sidearms.