Hanna 1413 µS/cm Conductivity Standard 500mL Bottle - HI7031L 0647608368066 is a standard glass formulation

is a standard glass formulation that is used for general use

reverse osmosis system verification

and anyone who wants the benefits of spring water from their tap

and restore water flow

Filter lifespan: ~2 months (varies by water quality and usage volume)

Hanna 1413 µS/cm Conductivity Standard 500mL Bottle - HI7031L 0647608368066 is a standard glass formulationHI7031L is a premium quality 1,413 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