A man with two watches will never know the correct time and a man with two meters will never know the correct voltage. What you don't have is a known accurate meter. If you know one meter to be correct and compare it to another meter you at least have a known to compare to an unknown. If you know the new meter is giving incorrect readings with significant error you can return it to the manufacturer or return it to the retail outlet you got it from. Most new handheld DMMs do not easily allow calibration adjustment or if it does then get a good known and calibrate your inaccurate meter against it. You also need a good stable source for your parameters to be measured.
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