DIMTFAC
Specifies the scale factor used to calculate the text height of fractions and tolerance values of dimension text. For example, if DIMTFRAC is 1.0 (the default), the text height of fractions and tolerance values will be the same size as dimension text, which has a height determined by the DIMTXT system variable. If DIMTFRAC is 0.5000, fractions and tolerance values will be half the size of dimension text.
Type: Real
Saved: In the drawing file
Range: Greater than 0
Default: 1.0000