Accuracy can be described in different ways by tool manufacturers:

1. As a percentage, e.g. ‘1% Accuracy'. This is normally assumed to be ±1% of Full Scale. For example, a device reading from 40-200 N.m with an accuracy of ±1% will have a possible error margin of ±2 N.m. This is a significantly greater percentage at the lower end of the range - at 40 N.m, 2 N.m represents ±5% accuracy and not ±1% as originally perceived.

2. As a number of graduations, e.g. ‘Accuracy, ±1 graduation'. Obviously at the bottom of the range, one graduation represents 100% possible error. Percentage error decreases higher up the range.

3. As a percentage and graduations, e.g. ‘Accuracy, ±1%, ±1 graduation'. A combination of methods 1 and 2, with the resultant inaccuracy!

4. As a percentage of reading, e.g. ‘Accuracy, ±3% of reading'. Initially this may appear to be less accurate than claims of ±1%. However, note the ‘of reading' statement! Of reading means exactly that. Torqueleader use this method of guaranteed accuracy throughout the scaled range of their tools and analysers.

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