take reading 4 to 5 times, and take its average
this will reduce error
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Measurement error: obviously!
yes, it is. The smaller the measurement, the higher the percentage error.
A good way to reduce error or increase measurement accuracy is to take several measurements and compute their average. In other words, you achieve accuracy through averaging. (This also validates the repeatability of the measurement.)
Calibration error and measurement error. Also, if the measurements are of different objects there may be random error.
The larger the sample, the lower the % error.. so to reduce a % error, increase your sample size.