Copper chloride and conductivity tester

[Draksis314]

1. The problem statement, all variables and given/known data

I put a conductivity tester into saturated copper (II) chloride, and the solution turned darker near the electrodes. What happened?

2. Relevant equations

None

3. The attempt at a solution

I don't see how copper (II) chloride would be affected by a conductivity tester.