Learn from my mistake when chasing ph...two probes WILL interfere with each other.

[2Wheelsonly]

So I always had my calc reactor ph probe and my ph probe for my tank bundled together (the wires). When I disconnect one my readings change on the other. Is this normal behavior? I am using the neptune branded lab grade probes.

 

[Breadman03]

Electrical interference is always a concern.