The ziffer package modifies the behaviour of characters in maths mode so that: ‘.’ is used as a onethousand separator (as is common in Germany) ‘,’ is used as a decimal separator (as is common in Germany) ‘--’ is represented with spacing as appropriate to such constructs as ‘1.000,--’. These conversions may be switched on and off. Author: M. V\"ath martin@mvath.de The package may be distributed and/or modified under the conditions of the LaTeX Project Public License (version 1.3c or later).