The JBL Permanent Test CO2 is a very convenient and maintenance-free method of continuous monitoring of the CO2 level in the water, which allows you to check the pH in the range of 6.4-7.8 without additional tests.
Reading the result is extremely simple and intuitive. The offered set is sufficient for uninterrupted measurements from 9 to 12 months, and the indicator fluid should be changed every 3-4 weeks to guarantee the correctness of the readings, because the coloring compounds may fade under the influence of intense light.
How to use it:
Add the reagents to the device for the permanent test and attach them with the suction cups in the aquarium on the glass. Compare the color of the reagent with the color scale sticker and read the value.