If you use the basal body temperature measurement to understand whether ovulation, it is recommended that you can use a glass thermometer, because although glass thermometers have disadvantages, such as easy to break will lead to pollution, as long as they are used in the process of their own extra attention can be. This kind of monitoring time is slightly longer, for healthy women with this kind of thermometer or relatively more convenient, the reason why it is not recommended to use electronic thermometer, mainly because the electronic thermometer due to the battery power supply condition, may lead to the possibility of error, so it is recommended to use the glass thermometer to give monitoring. Before monitoring the basal body temperature should be noted, first the night before the thermometer readings dumped to below 35 ℃, the second day on the case of inactivity, do not talk and then monitor the basal body temperature, give records and continuous records until the next menstruation, and then observe whether the basal body temperature biphasic.