Hanna 84 µS/cm Conductivity Standard (230mL Bottle)-HI7033M marine photometer or from Hydrofarm reflectors to

or from Hydrofarm reflectors to other brands of ballasts

For the best results

They're tested for quality

Measures TDS and salt levels of freshwater up to 9990 ppm

Hanna 84 µS/cm Conductivity Standard (230mL Bottle)-HI7033M marine photometer or from Hydrofarm reflectors toHI7033M is a premium quality 84 S cm conductivity standard that is prepared against a NIST traceable potassium chloride solution. Hanna conductivity solutions have the lot number and expiration date clearly marked on the label and are air tight with a tamper proof seal to ensure the quality of the solution. Hanna's line of conductivity standards have been specially formulated to have an expiration of 5 years from the date of manufacture for an