Dymax Crystal C02 Indicator LargeMonitoring co2 levels in your planted aquarium is very important for the health of your plants and fish. This kit includes a high quality CO2 Drop Checker and suction cup. Indicator solution sold separately.Small: 5.5cm L x 2.3cm W x 4cm H approxLarge: 5.5cm L x 2.7cm W x 4.5cm H approx
