Aquarium Fish Tank Carbon Dioxide CO2 Monitor Ball Checker Tester PH Indicator

Features : Made of acrylic material, transparent outlook. Easy observation, keep abreast of the situation anytime. Invisible groove design, convenient to open the top cover. Specification : Material: Acrylic Suitable For: Long-term CO2 monitoring Size of Checker: (Dia.)x(H) 25x37mm/0.98''x1.46''(appr.) How to Use 1. Will test agent about 15(or according to the actual amout) drops into the monitor, need not to add water. 2. Change again every 30 days, airtight preservation at room temperature. Warm Tips: Simply add couple drops of test solution and water into the checker. Stick the checker on the edge of the aquarium. Ensure water level cover the opening of the checker. Package includeds : 1 x Ball Checker 1 x pH Indicator Set Details pictures :