Thanks ladies, will persist, could well be that I'm not ovulating regularly anymore :(
I'd add to that. Make sure you drink plenty the night before (but nothing for a few hours before, at least). You want the saliva to be quite liquid.
Experiment with how much saliva.
I think it is quite accurate too, for me.
I assume you refer to the saliva microscope? It was quite distinct once I saw it, however I did note a couple of things.
One... you have to get the amount of saliva right.. if you lick too hard you might only end up with thin streaks, but if you get a blob... it doesn't dry out properly.
Two... make sure you do let it dry properly... I used to leave the plate exposed to the air for almost half an hour....
for the record: When I tested it against my OPK.. it was pretty accurate!
Good Luck!