Folks, if you've recently upgraded or renewed your annual club membership but it's still not active, please reach out to the BOD or a moderator. The PayPal system has a slight bug which it doesn't allow it to activate the account on it's own.
I used it as a par meter for a little bit, but youbhave to so some converting of parameters to get the par value. The slides are more for ammonia which is perfect when starting/cycling a new setup.