The Hanna Instruments HI 7033M conductivity calibration solution is an aqueous electrolyte solution for calibrating electrodes and conductivity meters with a scale of up to 200 microsiemens/cm, and has a conductivity value of 84 microsiemens/cm at 25 degrees C. It comes in a 230mL bottle. Conductivity calibration solutions are used to confirm and adjust the accuracy of meters and electrodes in agricultural, industrial, or scientific environments.

A calibration solution is used to calibrate instrumentation for accuracy in aquaculture, hydroponics, water-testing and for scientific applications. It is necessary to use a calibration solution similar in dissolved solids content to the solution to be tested in order to get acceptable accuracies. Calibration solution should be at the same temperature as the test solution to minimize temperature effect errors. Conductivity is the ability of a material or solution to conduct an electrical current.

Hanna Instruments manufactures analytical instrumentation and supplies, including pH meters, electrodes, chemical reagents, and buffer solutions. The company, founded in 1978 and headquartered in Woonsocket, RI, meets International Organization for Standardization (ISO) standard 9001.