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Check the date on your strips. Chances are they are expired and the meter knows this.
Newton meter is a measure of energy, E= fd, Energy equals .Newton (force) times meter(distance)
100 cm = 1 metre
Yes. The first E is a long E, while the second is a schwa-R sound (er/ur).
If the meter is sensitive enough and there is a resistance between the neutral and ground then the meter should be able to detect it.