Adjusts Abrasive Shaker vibration by simply turning a dial.
 
Easy to use -  just plug Variable-Speed Control into a 115 volt outlet and plug Abrasive Shaker Motor into receptacle on bottom of Variable-Speed Control. Instantly, you can control the vibration level of your Abrasive Shaker depending on humidity levels or width of your funnel. 
For use with 6120-11 Super-Pro Abrasive Shaker Motor.