The text on the devices measurements are as follows:
Height of time - around 27mm. Additional details - around 11.5mm These are on a high quality LCD display.
The text size cannot be altered, however, there are a choice of optimum colour ranges which are also suitable for those who have visual difficulties. These are as follows...
White Text on Black Background
Black Text on White Background
Yellow Text on Black Background
Black Text on Yellow Background
The screen has the added benefit that it is visable from all angles, seated or standing.