Aquarium CO2 Indicator Test Kit Glass Drop Checker , ISTA Solution 10cc Real time for Indicator Drop Checker LONG TERM MONITOR test - Real time Solution 10ML Aquarium live plants - Regulator Solenoid Monitors levels of CO2 &PH in aquariums. Ensures fish and plants live in a healthy environment. Made of glass, for max reliability. Provides accurate dosing of CO2. Easy reading with color chart.