NGUI timer problem

I am trying to make a timer with NGUI. I have the code in place, the timer works, but it looks weird. The pivot is set to center, but the width of the characters is not equal, so the width of the timer changes, giving an ugly effect. I used BMFont to make my font, but i didn't find any option to set the characters to the same width.

Is there an option in BMFont, or in NGUI, or is there another bitmap font generator that allows me to make equal width characters?