Low-power measurements aren't about how small a value you can detect — they’re about how accurately you can measure those small values. Accuracy is specified as ±(gain error + offset error), or ±(X% + Y), where X is the percentage error and Y is the offset error. This means your measurement includes both a fixed offset error of Y and a scaling error of X percent.
Example: the current measurement accuracy for the main channel of the Otii Ace (257-3555) when measuring low currents is ±(0.05% + 25nA). So if you measure 1 µA, the expected error would be a maximum of 0.0255 µA.
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