Completely submersible and, yes, held on with suction cups.
If you're buying a used one, be prepared to buy a new probe. They do wear out after a couple of years and give the wrong pH reading.
Good for you.
Now the fun comes. Soon you'll want a co2 set up, then you'll want lights, then you'll want more plants, then you'll want more tanks......
i bought the regulator and ph controller for $180. i had my co2 tank filled at the paintball store. i have 2.5 watts per gallon. i have a tank full of plants. all i need now is to get rid of my emperor 400 and get a new filter
Tim, did your yellow electrode come crusted over with that salt solution? I'm not sure what chemical they use and I'm hoping I can just rinse this thing out with tap water and be fine. Then use those buffer packets they give out to callibrate right?
I have the directions. They are just a little too vague for me. Or maybe I'm just nervous and want more details. haha. They say to calibrate the SLOPE to 4 on the instructions that came with it. Unless there are special aquarium guidelines that are different.