If the users know the amount of the systematic error, they may decide to adjust for it manually rather than having the instrument expensively adjusted to eliminate the error: e.g. in the above example they might manually reduce all the values read by about 4.8%.
The range in amount of possible random errors is sometimes referred to as the precision (the spread of measured values).
The effect of random error can be reduced by repeating the measurement at the same controllable condition a few times and taking the average result.
Electrical noise on electrical components in an instrument or temperature fluctuation on a quantity to measure may induce random errors in the measurement.
If the instrument has a needle which points to a scale graduated in steps of 0.1 units, then depending on the design of the instrument, it is usually possible to estimate tenths between the successive marks on the scale, so it should be possible to read off the result to an accuracy of about 0.01 units.