Hi there,

I have also bought a MBM and I have only just got the hang of it. There are actually quite a few threads here about other peoples experience with it.

I have found that you need a fair bit of spit! I scoop it out with my finger and place on microscope. I normally wait longer than the recommended 10 minutes as you wont get a reading if the spit is still wet. I normally test first thing in the morning. I fiond that an afternoon test is not conclusive.

Be persistent with it because it took me a couple of months to work out what I was doing but eventually got the ferning! Good luck.