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Slack Tube® Manometer
1211 Series Roll-Up Manometer with Laboratory Accuracy Dwyer® Slack Tube® Manometers are as accurate as the finest laboratory "U" gages - yet they are made to roll up compactly for easy carrying and to withstand rough usage. Simply unroll the Dwyer® Slack Tube® Manometer and set up to read static pressure, vacuum, or differential pressure. Magnetic clips hold it firmly to any steel surface or hang it on a nail. Turn connectors one revolution to open. When the pressure is imposed, add the number of inches one column travels up to the number of inches the other column travels down. When reading is completed turn connectors to seal columns, roll up manometer into compact coil and tuck it away in its plastic case or a tool box. No fluid lost. No loose caps or inserts to lose.  All models have over pressure safety traps in the top of both columns to prevent loss of fluid due to over range pressures or surges in pressure. Slack Tube® Manometers are suitable for intermittent total pressure to 50 psi and vacuum not exceeding 20" Hg. Avoid temperatures above 130°F and continuous high total pressure. Not for use with red gage fluid; use only water or mercury. 
Models/Ranges 1211-8 4-0-4 inches of water or mercury 1211-12 6-0-6 inches of water or mercury 1211-16 8-0-8 inches of water or mercury 1211-24 12-0-12 inches of water or mercury 1211-30 15-0-15 inches of water or mercury 1211-36 18-0-18 inches of water or mercury 1211-48 24-0-24 inches of water or mercury 1211-60 30-0-30 inches of water or mercury 1211-72 36-0-36 inches of water or mercury 1211-120 60-0-60 inches of water or mercury Metric Ranges 1211-50 25-0-25 centimeters of water or mercury 1211-100 50-0-50 centimeters of water or mercury 1211-200 100-0-100 centimeters of water or mercury