The potentiometer is the device that is used in the measuring of the potential difference.
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A time measuring device. Also known as a clock
A thermocouple measures temperature difference between two points, producing a tiny voltage corresponding to the difference in temperature. To measure temperature with a thermocouple, you need to know the temperature of one junction and calculate the difference from the table or equation for the type of t/c used. An RTD changes resistance in response to temperature--to measure temperature with an RTD you measure its resistance (usually by putting a known voltage across it and measuring the current).
One possibility could be Visual Display Device (commonly known as a monitor !)
I believe that would be a metaphor describing a revealed secret.
An invocation in poetry is a manner of addressing the Gods known as an 'apostrophe'. For example, using 'O Mighty God' in reference to God- the 'O' is known as an invocation.