It is forty nine thousandths of a millimeter.
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Zero point zero four nine millimeters.
One tenth of a millimetre (or ten hundredths).
Do you mean what is the abbreviation for millimeter? Because that is "mm". When you write units in fractions, you will probably want to use the abbreviation.
Forty-nine thousandths millimeter.
1.000 millimeter (as many zeros as you want after the decimal point)