Have done a bit of research and it's all said that a digital thermometer (as long as it shows 2 or more decimal places) is fine. I'm not sure if it's the thermometer or just my crazy temps. But I have seen others that look just like mine, so I'm not super concerned.... yet!
Going for my second round of BT's on Thursday to test my oestrogen and check that I actually am o-ing and I get the results back next Wed. So for me and for another high temp for you tomorrow!!