Digital Basal Thermometer,1/100th Degree High Precision, Quick 60-Sec Reading, Memory Recall, Accurate BBT Thermometer for Natural Ovulation Tracking

OverviewClinically Accurate Basal Body Thermometer for Natural Family Planning Reading in 60 seconds, faster than any other BBT Easily replace the battery in 4 steps-When the empty battery symbol is displayed, this is how you can replace it: open the cap; hold the battery case between your fingers and remove the battery with a needle; insert a new battery with the '-'sign facing up; put the cap back on.