i need help

[canadiancutie514]

i got a thermometer that came with my 5 gallon tank,the problem is i can not read it,so i have no idea the temperature in my tank i got a Betta and i know they like it a certain way there are several colors that show up with the numbers one of them being green

 

[fayfay]

Its 28 celcious going on 29 it seems.

 

[canadiancutie514]

i never had trouble with a thermometer before,i do not even know what they call it...lol