Drop Checker Kit, Dual 4.2 & 8.4 dKH
Too much dissolved CO2 can be harmful for fish and livestock. With this kit aquarists can accurately measure optimal CO2 levels that promote plant growth while helping to keep fish safe.
The Dual kit comes with two glass drop checkers, and two pre-mixed CO2 indicator solutions; 4.2dKH type and 8.4dKH type. The 8.4dKH type can measure CO2 accurately at higher levels. Using two drop checkers will provide a more accurate check on CO2 levels.
The 4.2dKH solution will turn green at 30ppm dissolved CO2, and the 8.4dKH solution will turn green at 50ppm dissolved CO2. The 4.2dKH solution will turn yellow first if the CO2 is too high, the 8.4 solution will turn blue first if CO2 is too low. By keeping both drop checkers near green at all times, aquarists that typically maintain higher dissolved CO2 levels can ensure greater accuracy in measurement. Further, dual drop checkers will provide a check on each other for additional measurement reliability. Both kits include instructions and a pipet for easy solution changes.Dual kit with 8.4 & 4.2 dKH solutions:
Green color indicates between 25-30 ppm (for 4.2 dKH solution) (and 50-60 ppm for 8.4 dKH) levels ideal for plant growth
Blue color indicates lower levels of CO2; CO2 injection can be increased gradually until the indicator solution turns green.
Yellow indicates high levels of CO2 that can be harmful to livestock, if the solution is yellow lower the CO2 injection and check the solution every few hours until the color is green.
4.2 dKH measures normal and low range CO2 levels.
8.4 dKH measures higher levels of CO2
By keeping both drop checkers near green at all times, aquarists that typically maintain higher dissolved CO2 levels can ensure greater accuracy in measurement. Further, dual drop checkers will provide a check on each other for additional measurement reliability.
Additionally kits include an optional darkening agent solution capsule which is concentrated with Bromothymol blue, ph indicator reagent. The reason is depending on tank conditions, background color, and lighting some aquarists will prefer a darker, more pigments solutions for easier reading.