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If a lamp is in circuit then it's resistance will change with the heating effect even if small and would cause a difference in reading each time you try.
I just plucked a figure out of the air for the resistance of a lamp
Peter
I will reiterate - your original question was why are you getting a varying voltage - when in fact you were measuring at two different points in a circuit with different reference points which to quote an US mate of mine 'was polluting your results'
As someone has already said stick your meter probes into a socket and take a measurement.
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