What OPK test do you use?

Sarah

I'm currently using the Up and Up brand of ovulation tests and just curious on other womens preferences of OPKs. I think I want to try some other options so I can pinpoint what is my peak date (first timer & pretty eager). So far I have very faint lines and hoping it's soon to BD, but feel like I should test twice a day when the time gets near without running out of tests.

Which ones do you use?