http://www.wikihow.com/Take-Your-Basal-Body-Temperature took my BBT Take Your Basal Body Temperature daily basal temperature Record your basal body temperature (BBT) daily. http://www.wikihow.com/Take-Your-Basal-Body-Temperature Track your basal body temperature (BBT) daily http://www.wikihow.com/Take-Your-Basal-Body-Temperature it reads to the tenth decimal place daily basal temperature it reads to the tenth decimal place