I use a fertility monitor and my cervical mucus to predict my fertile window and my waking temps to pinpoint when I actually ovulated.
I do have an ovulation microscope, but I have found that it is not very accurate. My husband spit on it just for fun, and even he had ferns...it can all depend on if you ate anything with a lot of sodium in it that day too.
I like using the scope as a secondary signal of fertility, but I wouldn't recommend using it as your primary ovulation predictor.

go get some ovulation predictor kits at the drug store, they are much more accurate.
have you read the book "taking charge of your fertility" by Toni Weschler? I highly recommend it for anyone TTC.