At the end of 2016, we unveiled the new Klarity AirSwitch - a handheld control switch for any vacuum pump.
The AirSwitch has a toggle button that controls airflow. The three setting are In, Hold, and Out, so you can make detailed adjustments. The AirSwitch is incredibly light-weight and fits easily in one hand.
We have a short instructional video that shows the AirSwitch in action: