. If you have any questions, please let us know.

are these manufacturer probes? or lamba probes?

Hello, these are compatible probes

does it need calibration or a simple replacement

it is recommended because it depends on the probe and also on the regulator

it's for an aquarite pro

A moment

For pH https://ph-redox-pool.com/gb/hayward/1862-ph-probe--for-aquarite-pro.html

For redox orp https://ph-redox-pool.com/gb/hayward/1897-orp-probe--for-aquarite-pro.html

my 2 probes are 8 years old, and I have algae problems that appear, when I measure PH and close with the strips, I have too much chlorine and according to the marks of my strips, it has not gone from PH then that the aquarite is 7.4

You can test your probes like this: https://ph-redox-pool.com/gb/content/16-ma-sonde-ph-est-elle-hors-service-

OK

https://ph-redox-pool.com/gb/content/17-is-my-redox-probe-out-of-order

after 8 years, should the probes be changed? or did they have to be changed first?

It is necessary to change the probes if they no longer work . the lifespan may vary