Manufacturer of the BALL-IN-THE-WALL® and BALL-IN-TUBE airflow direction indicator that tells you which way the room pressure airflow is going, into or out of the room. No electricity required for visual-only models. Includes built-in failsafe feature! Great for healthcare infectious isolation, operating rooms, central sterile supply, labs, manufacturing, cleanrooms, etc. Visual-plus-Alarm units available.
ADI BALL-IN-THE-WALL® Indicator BAULIN-TUBE Indicator WISEMAN-TUBE Indicator