Vendeur: aquaworld224 (345) 100%, Lieu où se trouve: Cambridge, Lieu de livraison: GB, Numéro de l'objet: 152295680776 Les Détails: You are purchasing 20ml Aquarium CO2 drop checker solution, 4dkh pre-mixed with indicator (Bromothymol Blue) Usage:1. Add the solution to your drop checker.2. Place your CO2 drop checker into your aquarium. 3. After a few hours, the colour of the solution indicates the CO2 level in your Aquarium. Blue indicates low CO2 level.Green indicates good CO2 level.Yellow indicates high CO2 level (harmful to your fish). Please note: you are purchasing the replacement liquid, the glassware is NOT included.