Examples
In electronics, by attaching a multimeter, oscilloscope, or other probing device, small amounts of capacitance, resistance, or inductance may be introduced. Though good scopes have very slight effects, in sensitive circuitry these can lead to unexpected failures, or conversely, unexpected fixes to failures.
In debugging of parallel computer programs, sometimes failures (such as deadlocks) are not present when debugger's code (which was meant to help finding a reason for deadlocks by visualising points of interest in the program code) is attached to the program. This is because additional code changed timing of the execution of parallel processes, and because of that deadlocks were avoided.
Read more about this topic: Probe Effect
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