Choice of Buffer Solution for Davey Lifeguard Redox Probe: 475mV or 650mV?

Client:
Hello, for a Davey Lifeguard redox probe, should I use a 475mV or 650mV buffer solution?

Technical Advisor:
Hello,
One moment, let me check the documentation.
650 mV

Client:
Thank you.

Technical Advisor:
https://ph-redox-pool.com/gb/pool-buffer-calibration-solution/620-650mv-buffer-calibration-solution.html