Sarah, I think you are far enough away from ovulation for it to not matter.

I switched thermometers mid "cycle" (I refuse to call what I have going on an actual cycle because nothing ever happens!) when I got my 2dp one. I sometimes checked with the 1dp thermometer to see if what I was getting would be the same on each. Basically, if I rounded the 2dp one off to 1dp, then I was getting the same temperature anyway. But I recorded my temps on my chart to 1dp anyway, as I didn't want anyone to know that's what I was doing!

BW