Repeatability is the closeness of measured values between repeated measurements of the same weight, carried out under the same conditions as follows.
At the same place
By the same person
By the same method
On the same equipment
Over short period of time.
In simple words, Repeatability is variation in readings when the same person measures the same part many times using the same equipment and method under the same conditions.
Repeatability in balances
Repeatability is one of the most important performance indicators of a balance. It is generally determined by measuring a single weight 10 times.
The quantitative indication of repeatability is achieved using the standard deviation.
Internal or official regulation will define weights, number of repetitions and acceptance criteria.