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Hello
I need redox probe for bs pool evo?

Hello , just a second

Ok

https://ph-redox-pool.com/gb/bs-pool/549-orp-probe-for-evobasic.html

It needs just replace or some kind of calibration?

Yes , it is recommended to calibrate because calibration depends on probe and regulator

To calibrate you need https://ph-redox-pool.com/de/poolpuffer-kalibrierungslösung/621-475mv-pufferlösung-für-sonden.html

Thank you

You are welcome