7.0 calibration solution for pH tester and pH controller. Use with either 4.01 solution or 10.01 solution (depending on aquarium pH) to ensure proper calibration of your test instrument.
For accuracy and to prevent contamination, pour required amount of solution into included 30 ml container for use. Do not attempt to reuse solution, or pour back into original bottle as the results will be inaccurate. Always close the lid securely, and store between 60-100 degrees F away from direct sunlight.
Follow instructions included with test instrument for best results.