http://www.fairhavenhealth.com/ibasal-thermometer.html?cmp=froogle&kw=ibasal-thermometer&utm_source=ibasal-thermometer&utm_medium=shopping%2Bengine&utm_campaign=froogle&gclid=CML_08yr-rUCFQ7znAodgRYA5w
Check this thermometer out. Even has an alarm built in to awake you.
