Finally figured it out...it I hold the button in (for a few seconds) it shows the previous temp...finally have a reading 97.58 for this morning...I actually thought that it would be a lot lower, am surprised! My "normal" day-time temp is 97.9, so am hoping this means that I actually Oed, but the OPK just didn't read it? I don't know...will find out in a few weeks either way