Are all OPKs created equal?

When I get pregnancy tests, I usually just get the cheapest of the cheap and they've always worked fine for me.

Is the same normally true of ovulation predictor kits? I don't have much experience with them, but I've seen they range very widely in their price.

Is there one in particular you stick to?

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09/07/14
I think they use the same premise as a pregnancy test, a little litmus paper that turns a different color if a certain amount of whatever hormone (I'm not sure which hormone OPKs test for... Katie, do you know?) is present in your urine.
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About Cassaundra Owens
Birth: February 13
On Moms.com since: Oct 11, 2013
I'm a little strange, pretty green, and learning to live life as a wife, future mother, and entrepreneur. Right now, my husband and I are trying for our first after 3.5 years of infertility and 2 losses. Viva la adventure! Join me too at MortalMommy.com!