Clean the liquid junction of your electrodes once a day or at least once a week to prevent clogging and to maintain accuracy. Immerse the electrode in the proper cleaning solution for about 5 minutes.
HANNA® offers a wide range of cleaning solutions, for general purpose and specific applications, to eliminate all kind of dirt or deposit from the electrode, and thus ensure correct measurements.
น้ำยามาตรฐานสอบเทียบ
HI4007-02 ISE 100 mg/L (ppm) Chloride Std , 500 ml Bottle
HI7074L - RfE - Anorganische Substanzen - 500ml
HI98120 ORP/°C-Tester, waterproof
CTK Chlor Frei 

