iCentrifuge is a free app that lets you quickly calculate RCFs or RPMs for centrifuges that do not support on-board conversions.  You can also pick from pre-defined rotors or use your own.  With the free version of the app, save up to 10 configurations in your favorites and have access to 6 pre-defined rotors from major manufacturers, like Eppendorf, Beckman Coulter, and Sorvall.

iCentrifuge also comes with an optional subscription to a live, up-to-date rotor specification feed.  The subscription is only $1.49/year and with it you can forget the hassle of searching rotor specifications on the web.

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