Hanna Cal Check Solution, case of 25 chillers-heaters-and-purification Supplementing calcium and magnesium is

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Hanna Cal Check Solution, case of 25 chillers-heaters-and-purification Supplementing calcium and magnesium isThese sachets are for use with the Hanna HI9813 6 GroChek portable pH TDS EC Temp meter, which utilizes the Cal Check Solution to determine whether the probe is in need of cleaning or replacement. The sachets should only be used once, then discarded, in order to avoid contamination and improper readings.