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Its normal There is a difference of 10-12 mm Hg between both the upper limbs...

Doesn't matter which hand u measure if difference more than 20mm hg then need to be worry else no problem. Use manual SPHYGMOMANOMETET FOR BP measure.thanks

Use in left arm that will give you accurate blood pressure value

Don't overthink it. These are inherent flaws of electronic measuring devices. Take an average instead of single measurements. Also follow the correct procedure. Also statistically 10 mm difference between both arms is not significant. The device should be kept at the level of the heart. Placement of the cuff should be optimal. Every electronic device however has its specific working instructions that need to be followed.