Wristwatch gadget indicates fertility

Knowing when the time is right to try for a baby could soon be as easy as checking the time of day or month.

Vancouver company Pheromone Sciences has developed a wristwatch-like gadget that tells women when they are about to ovulate.

New Scientist magazine said it worked by measuring changes in the acidity of sweat, which was determined by hormone levels indicating fertility status.

Worn while sleeping, the monitor includes a chemical sensor and microprocessor that calculates the changes, which are displayed on the face of the device or sent to a computer.