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If you are looking for precision resistance measurements, get a bridge and use kelvin clips - otherwise, you add way too many variables in your measurements.
Take a look at your meter - you have a power transformer with no magnetic shielding right behind the meter. No way you will ever get repeatable accuracy with 60 cycles of induced power being delivered to the meter movement just centimeters away...
Looks like a hobby grade Conar or Heathkit meter - a HP 410C is pro grade, and can be had for a few dollars in unrestored condition, giving you a magnetically isolated power supply, megohms of input impedance, and the important expanded resistance ranges, better than today's dmms.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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