Client:
I'm looking for pH and salinity
Technical Advisor:
Hello
Are you looking for a pH probe and a redox probe?
Client:
No, calibration solutions
For pH and salt
Technical Advisor:
What values?
Client:
I've had the devices for 20 years
pH 7 oo tds 940 ppm
Technical Advisor:
We only have pH 7
https://ph-redox-pool.com/gb/pool-buffer-calibration-solution/617-ph7-buffer-calibration-solution.html