Pneumatic Squeeze Bulb Dynamometer with 30 PSI GaugePneumatic Squeeze Bulb Dynamometer with 30 PSI Gauge is a bulb like device used to test the strength of hands and fingers. You simply squeeze the rubber grip and the air pressure measures your strength in pounds per square inch (PSI). This Baseline Pneumatic Dynamometer features a convenient reset button to keep track of your progress. Inexpensive evaluation instrument used in the rehabilitation process. Baseline Pneumatic Dynamometer Features: Rubber