Know which days you ovulate with the Ovulation Biotester, a new quick, convenient and foolproof method of measuring fertility. By monitoring biochemical changes in your salvia, the battery-operated device can identify fertile days in seconds. Simply place a saliva sample on the glass eyepiece, switch on the built in light and examine it through the lighted magnifier. Since it's no bigger than a lipstick, the biotester can be used anytime, anywhere!
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