Another important thing to be considered when checking patient weighing scales (and one that I place in higher importance than absolute "accuracy" per se) is:- repeatability of results (aka precision). smile

Accuracy is the difference between the measured value and the true value.

Precision is the repeatability of successive measurements under the same conditions.

Accuracy % = (Actual minus Measured)/Actual x 100%

If you don't inspect ... don't expect.