ZRDR Glass Drop Checker Kit with 15ml Co2 Checker Solution The Most Accurate Monitoring of Planted Tank Co2 Levels

Impressed with the ZRDR Glass Drop Checker. Accurately displays CO2 levels in my aquarium, making it easier to maintain the health of my plants and fish. The sleek and compact design blends in well with the aquarium. Would definitely recommend it to fellow aquarium enthusiasts.

The suction cup I think is silicon which means it will function properly for a long time. The plastic suction cups tend to get stiff and loose there effectiveness. They supply a small bottle of fluid that should give you multiple refills of the site glass. No complaints.

So far so good. Got the product to varify my low co2. Put a suito diy kit cp2 generator on and walaaa. The next the color of the solution is to my from blue to green. Only negative is the bottom suction cup came up on me ( might user error ) and the u bracket that goes over tank rim is way to small. Might fit on smaller aquarium. I tried on my 55 gal

It's beautifully made and nicely packaged. However, I found that the indicator fluid was slow to react, and tended to just stay yellow once it got there.

This was a snap to set up . really works . I set mine by the output of my CO2 defuser , not in the stream , but nearby . it does work changes from green when my CO2 timer kicks in to blue when off . Highly recommended !

The media could not be loaded.  Works as expected, added 15 drops recommended on the bottle and NO water. I didn't show it but I also added more C02 to my tank and it adjusted accordingly...still learning about C02 usage itself so not a perfect green but I'd prefer not to gas my tank while learning so I'm fine with that result. Easy to read accurate colors and no issues with suction power.

Works as advertised

New pH probe, calibrated to 7.0 pH at 25C does not agree with this liquid litmus test. Hardness is low. This should be yellow at this pH, and it is not. The indicator liquid does not seem to work under these conditions, anyway.