if you know the "index error", just apply that each time
And there's the rub...there's various ways to do that -- the meter I posted is the least expensive, least hassle way I have found to do that.
Or a person can purchase a Tektronix 5.5 digit (in calibration) bench meter like I have. You won't like the price but the .03% DC accuracy at full scale is nice.
The little meters are a snap to use. To adapt to the higher voltage scale twist the 2 red wires together and then twist the two black wires together.
"Usually" meters that have high accuracy in high ohms scales have acceptable accuracy in other functions.