Hanna Instruments - Cal Check Solution

These sachets are for use with the Hanna HI9813-6 Gro'Chek Portable pH/TDS/EC/Temp Meter. The Cal-Check feature of this meter utilizes the Cal-Check Solution in order to determine if 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.