Set the multi-state for digital tags

Hi everybody, 

I am trying to use multi-state for my digital tags, which are 0 and 1. But on the field values i can not specify an interval like from 0 to 0,5   = state 0 and higher than 0,5 = state 1. I can not input a decimal number. So how could i set 2 colors for my 2 states 0 and 1 ?

Thanks in advance!