The fully automated, compact, stand-alone CFPP tester Callisto 100 determines the low temperature operability in diesel fuel, biodiesel, blends and gas oils. Callisto 100 comes with a newly developed state-of-the-art Peltier element concept which allows the connection of a methanol-free cooling system. It ensures outstanding homogeneity of the cooling jacket, which is the most critical and decisive parameter for a correct CFPP value determination