@Dan, how about 200 RPM ones?
@Captain Nemo12, thanks, I checked out the software & it's very useful. I'm now trying other apps too.
EDIT: I checked 200 to 250 RPM with the app, it still too slow I think. Maybe need at least 300 RPM.
Last edited by kizwan; 03-13-2015 at 06:07 PM.