This item is a Fish Tank CO2 Monitor. It will provide convenience in monitoring carbon dioxide level in fish tank or aquarium, a practical accessory for aquatic plants, tropical fish and other ornamental and aquaculture ponds. Two different style combinations meet the needs, a very useful and durable helper for you. Features -Color:Transparent -Material:High borosilicate glass -Size:4.70X4.50X2.40cm/1.85X1.77X0.94in -Robust glass design: made from high borosilicate glass, this co2 detector is built to endure high temperatures and resist breakage - co2 analysis: the co2 note monitor offers analysis of carbon dioxide levels, ensuring your fish tank environment is always optimal -Effortless setup: simply place the detector in your fish tank to begin monitoring co2 levels, making it easy for anyone to use -Universal compatibility: suitable for use in a variety of fish tanks, including both freshwater and marine aquariums, ensuring it meets diverse needs -Fine workmanship: With terrific craftsmanship and light weight, bring you satisfied using experience Package list: 1 x carbon dioxide detector