The series 1227 is a regular U-Tube manometer that is able to read high range pressures via the right leg, or can be used as an inclined manometer for the reading of low range pressures on bottom leg. All that is necessary is inclining the manometer and wait until fluid levels are at zero point. A spirit level is not necessary. The strong clear plastic manometer unit offers single direct reading in dual ranges. Both as a U tube reading 0 to 16" of water and as an inclined plate reading -.20 to 0 to 2.6" of water.
The model 1227M Metric is 0 to 400 mm water column. The gauge is held in position by magnetic clips, on the select duct surface. The manometer offers a useful, versatile as well as a low cost manometer. The design is well suited for servicemen and installation.