Can the FT440 measure TPM values of Ghee or Milk fat?

Not accurately.
Ghee and milk fat have a significantly different chemical composition than vegetable fats. They naturally contain small amounts of polar substances such as water, milk proteins and salts, which can affect the measurement.
The devices are specially adapted to the chemical profiles of vegetable oils. Even if a measurement is technically possible, the displayed TPM number is not reliable for ghee or milk fat

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