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CO2/PH Glass Drop Checker with Solution

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Glass pH Checker - 25 mm dia.

The Seachem Glass pH Checker is a state of the art pH checker that can be used in both freshwater and saltwater aquariums. The pH checker is affixed to the tank with included suction cups and helps to closely monitor the sensitive pH balances within the tank. A highly sensitive indicating solution comes with the device, and will change color when submerged in the water so that the aquarium owner will be alerted to any changes in the chemical balance of the tank. The pH checker makes monitoring CO2 concentrations and pH levels in planted aquariums a walk in the park. Works effectively in any size aquarium. Has a diameter of 25 mm.


The Seachem Glass pH Checker works with any size aquarium. Holding the funnel side of pH Checker upward fill the small bulb with 20 drops of indicator solution. Slowly turn the funnel side down avoiding any spillage of the solution. Insert pH Checker into aquarium funnel side down trapping air in the funnel. Attach the pH Checker in aquarium at the furthest point from any diffuser.

The color of the indicator solution will change yellow to green to blue according to the pH of the water. A more yellow color indicates lower pH / more CO2. A more blue color indicates higher pH/less CO2.

Reviews (2)

  • 5
    Works like advertised.

    Posted by Jim Coulter on 22 Aug 2022

    Got it quick. Exactly as described. Nice price

  • 5

    Posted by Derek Girouard on 23 Sep 2020

    Works and looks great. My betta loves to hang out on top of it under the floaters.