JBL Water Test Refill, For freshwater aquariums, ProAquaTest CO2 pH Permanent 2 units

Advanced water test series: Reclosable reagents for use with ProAquaTest CO2-pH Permanent, Ideally suited for permanent direct measurement of the optimum pH value and carbon dioxide content Simple and safe control of water values in freshwater aquariums Long-term test for fertilisation control: Put reagent into the long-term test device and attach it to the glass pane with suction cups in the aquarium, compare the reagent colour with the colour scale sticker and read off the value Display of pH value from 6.4 to 7.8 and CO2 content Contents: 2x JBL Water Test Refill for JBL ProAquaTest CO2-pH Permanent