Calibration of ph sensors

[Anthonyvigneron]

I am new to Domoticz and have managed to integrate raspberry pi3, various Atlas Scientific sensors and managed all this in Domoticz to manage and monitor an aquarium.
I need to clean and calibrate the ph sensor every week really, what’s the best way of doing this (with calibration at 7, low and high pH)? I looked on internet and wiki but couldn’t find the answer so coming to this forum!
Thank you for your help!