1. download and install APP to your smart phone.
2. open microscope les cover, stick it to your smart phone or teblet lens.
3. press lens close to measured object, then you can observe clearly on phone.

ovulation check: 

in morning take few saliva under tongue with clean finger and put it on s100 lens. (don't brush teech and menstruation test invalid.)

Note:

when ovulation check dry saliva to moderate, if too many please using wind and sunlight shorten drying time.