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For an analog ohmmeter, with a needle that moves left and right: The needle is spring loaded; when current is running through the meter, the current causes a small magnetic field in the windings of the meter mechanism, causing it do deflect to the right.
If you're measuring current or voltage, if no current is running through the meter, then no deflection, so it should read zero on the left hand side of the scale. When measuring ohms (resistance) on an unenergized circuit, the battery in the meter provides the current. When you short the 2 leads together you have zero resistance to current (0 ohms). When you have an open circuit, no current flows, so there is an infinite resistance. So infinity is on the left side of the scale when no deflection, and zero is on the right side with maximum deflection (maximum current).
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CoachThe ohm meter scale is reverse of other measuring devices because it is logarithmic. This is due to the large range of values ohms can take, and a logarithmic scale allows for easier readability across this wide range. The scale is designed this way to accommodate precision in measuring resistance values efficiently.
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