Al, you don't specify what you want to use it for, but the upper
speed is going to be way too high for tissue culture work with orchids.

Keep in mind that some orchids don't like 24 hr/day cycles for
tumbling. Some do best with a few hours on, followed by a few hours off.

I think there are plans on the web somewhere for do-it-yourself
rigs; ditto with eBay and Labx. Save some bucks.

-AJHicks
Chandler, AZ