1227M - 

Series 1227 Manometer - Most versatile and useful low cost manometer we know of. Designed for installation and servicemen. A sturdy, clear plastic manometer, it offers single, direct readings in two ranges: As a U-tube, it reads from 0 to 16" of water; as an inclined gage, it reads from -.20 to 0 to 2.6" of water. Model 1227M (Metric) is 0 ? 400mm water column as a U-tube and -5 to 0 to 70mm water column as an inclined gage. ?How-to-use? instructions are printed directly on the scale.