Which is which probe!!!

[Gabe aqua]

Hey guys that have the apex pro what is the what is the difference between these two probes I know the black one is temp and what is the difference between the blue and red one. Which one is the orp probe and which one is the ph probe.

 

[YOYOYOReefer]

Blue= Ph
red= ORP

 

[Gabe aqua]

Blue= Ph
red= ORP

Thank you so much