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Glass drop checker Suction cups included. Glass drop check is about 6cm/2.36? in height Aquarium CO2 Monitor pH Packaging 1 x glass drop checker 1 x suction cup How to use: 1. Will test agent about 15 drops (or according to the actual amount) into the monitor, no need to add water 2. Change again every 30 days, airtight preservation at room temperature. Note: Simply add couple drops of test solution into the checker. Stick the checker on the inside edge of the aquarium. Ensure water level cover the opening of the checker.(note solution not include)