The Handy Roll-Up Manometer With Laboratory Accuracy Fig. Slack-Tube Manometer rolled up for easy handling and storage. 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 on 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 circular metal case or a tool box. No fluid lost. No loose caps or inserts to lose.