Online Lift certification

Hello group, I have been following this group for a couple years now. I appreciate the wealth of knowledge out there among all of my fellow window cleaning professionals. I am wondering if anyone has used any online certification courses for boom lifts and scissor lifts? I have 2 employees that need certification, and thought online certification would be easier to arrange with our busy schedule. If anyone has used a particular site or company any suggestions would be appreciated.

Matt Liudahl
Mr. Squeegee Window Cleaning
Bismarck, ND