Facebook, Instagram, and blog email list joined. I have a ultra low phosphorous tester and I love it. It's super accurate, and even easier to use. Probably one of the easiest testers available on the market.
I currently own the alk checker. It has been a life saver as I am color blind. This has made testing allot easier. I would love the other checkers. Cal is another one that is really hard for me.
Joined the email list, created an instagram account and followed, liked FB and reviewed on the Hanna website. I hope I did it all, I hardly ever enter these contests. This is a really great prize though!