This BBT is tried and true when it comes to accuracy. It leaves a few things to be desired (such as backlight, and I found that the batter life is fairly short). If you're looking for a great priced BBT, this is the one for you. Here's a tip... after you conceive, the thermometer works well to tast the bath water temp for baby :).Get more detail about Omron Digital Basal Thermometer with Beeper #MC-301N (Case of 10).