Is a manual freeze testing assembly fro ASTM D2386 mounted on a support rod. The double walled test tube is firmly attached to the assembly to be concentric with the wound wire stirrer. It includes a precision motor moving the wound wire stirrer at 1 to 1.5 cycles per second. The test tube is lowered into a cold bath to begin testing. When the fuel sample freezes the assembly is manually lifted from the cold bath for the operator observe the melting point temperature. MF-11 is similar to Model MF-10, but with the additional capability to signal the operator to make the observation for freezing when a predetermined sample temperature is reached.