Exergen brand forehead digital....Oh goodness is it easy and in split seconds and not subtracting or adding anything! Walgreens carries them and they're like 30.00, but used so much and last forever and so easy for moving targets! HIGHLY reccomend them!

For Fertility BBT, I used the Target or Walgreens off -brand digital thermometer for good consisitant and accurate readings...both were under 10.00....used for over a year with good accuracy...didn't use with my two other pregnancies since they were "surprises!"

I used the Walgreens brand BBT thermometer and never had a problem with it. It was always consistent.

I used the oral BD thermometer. it worked fine...I liked it because it had a memory and a light display.

I just started using the BD digital... I really like it better than the "old fashioned" one I was using before.