The latest in fertility tests involve viewing your saliva under the microscope to check for 'ferning' which indicates you are fertile.

Pros: You can re-use it over and over, so cheaper in the long run. Less gross to focus on a bodily fluid other than urine or cervial mucus.
Cons: Must do it first thing in the morning. Slightly more difficult. May not be as reliable.

It is more difficult than peeing on a stick for the urine ovulation tests, but if you start viewing your saliva a week or so before you expect ovulation and then you will be a pro by the time ovulation starts. When you are about to ovulate, your saliva starts to 'fern' from the increase in estrogen. There is nothing magical about the kits, but most of us don't have a microsope around the house, so it is nice to have it all in a kit with instructions.

Click here for a chart that illustrates what the saliva looks like during fertile and non-fertile times.