it is a very good product!!!

Does what it needs to. Make sure you move the checker around in your tank to get readings from different areas as some spots in tank don't get as much circulation

Very easy to use and I have one in all of my aquariums.
Best buy really. I suggest gettin a smaller sucktion cup :)

recommended for the price and what you get

easy to use, great price, fast shipping.

would be nice if there si syringe in complet to fill these one...

Good price

great value