Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Planted Tank CO2 System (Drop Checker with Solution)

Most drop checkers are hard for me to fill. This was so easy. I held the drop checker at an angle, almost sideways, then opened the bottle of solution and inserted a plastic pipette to half fill the drop checker with the solution the first time. The second time I just held the drop checker at an angle, opened the flip top of the 60ml bottle of solution and filled it up half way. Faster and even easier that way. It's well made and strong. You have no glass tubes to worry about breaking off and cutting your hands. It's very easy to see the color. A lot of drop checkers come with one little flimsy suction cup that sticks to the glass about a week, then you have to buy another one in order to even use the drop checker. This one comes with 2 well made, very sturdy suction cups. I liked this JARDLI Drop Checker for $10.49 so much, I ordered a 2nd one and received it today. I just put it in my 45G high light planted tank. It can be well hidden behind plants, but I think it's so pretty I put it where it can be seen and so I can look at the solution color and know how my CO2 is doing. I'm extremely happy with this great product.

Much easier to use than the typical curved neck drip checkers because you don’t have the issue with the reagent getting stuck in the neck. Looks pretty good in tank and is easier to see as well.

This co2 checker is so blue and waiting for it to turn green. Oh wait, it’s only been 12 seconds since I placed in my tank! If I come back to edit my review, this will mean that it never transitioned to green and that will not be good. Anyway, while I wait, this checker is a perfect size and was easy to fill. It looks better than the traditional co2 checkers in my opinion so I hope it works.

I've got a couple of different kinds of bulb CO2 drop checkers. This one works just fine. Several folks have mentioned in their reviews that it's difficult to get the liquid out of the bulb to refresh the liquid or clean it. The simple solution is simply to use an eye dropper or pipette to remove the old liquid.As I said, it has worked fine for me and it's size doesn't seem awkward for my 20 gallon tank. Four stars because I haven't owned it long enough to give it five. Time will tell.

These are great. I like the circle design as it’s more unique. The drop checker works perfectly and is well made. I made it clap on a handstand out of pure joy at how much I enjoy this checker.

Very nice, elegant. But initially I have problem maintaining the suction cup in place. It turned out that it will only stick plemenskih on glass. If it's a plastic surface (one side of my aquarium is plastic for the internal filter system and the opposite side of my co2 difusor) it will keep falling off.A tip to make the suction cup sick better : warm it with hot water, making it softer, then sick it to the clean dried glass surface, by partially emptied the tank.Tip to fill the drop checker: use a 1ml syringe.Nonetheless, since I have a mano tank, every little space is precious to me. So, I am considering using an over the aquarium hanging drop checker (upside down U shaped) instead.

Pay attention to the size. In a 5 gallon it’s almost comically large, but it does the job quite well as a drop checker.

Very unclear directions