saliva ovulation test

hi all i have been looking at these ovulation testers that use saliva .
has anyone had any experience with these ? if so what do you think of them ?

Thanks

They are easy to use I almost bought one off amazon. I believe u can use em to tell if your pregnant also

I did have one i found it hard to tell properly if i was ovulating. I brought myself a clearblue digital ovultion kit and i find thats the best of the lot. expensive but has always worked properly for me

I thought they'd be really cool but a few people have told me they had a tough time using them and/or they broke really quickly after purchase(they get fogged up on the inside and hard to read)