6. Duo Fertility Monitor

The Duo fertility monitor illustrates the power of effortless, round-the-clock monitoring. Women wear a silver dollar sized temperature sensor under the arm to detect the subtle temperature increase that precedes ovulation. The sensor wirelessly sends the information to an egg-shaped base station, which tells the wearer a week in advance when she is at her most fertile.

While physicians have encouraged women with fertility issues to monitor temperature for decades (ck), the accuracy that comes with continuous monitoring—the device takes temperature readings up to 20,000 times a day—and the fact that the user has to do very little to aggregate the data , has made an enormous difference in the value of this metric. According to a study from the company, the monitor is as effective in getting women pregnant as is expensive and potentially risky in vitro fertilization (IVF) treatments.

http://www.duofertility.com/

Cost: $800

Available now.