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Digital measuring instruments

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Start by asking which quantity you want to measure and what decision the result will inform. Measuring range, resolution and stated accuracy describe different things; a high-resolution display alone does not establish suitable measurement accuracy.

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Define the measurement task fully

Starting point Decision Result
Dimension of a component Record the quantity to be measured, expected value range and accessible measurement points Only instruments with a suitable measurement method and design remain.
Distance to a remote surface Check the target point, range and conditions of use against the instrument specifications The measurement distance falls within the documented range.
Value for deciding whether a tolerance is met Compare the precision needed for the decision with the specified accuracy Resolution and accuracy are not confused.

Example: measuring a recess before installation

Decide whether you need the internal width, depth or distance to an opposite surface, and what degree of deviation still matters for planning. This determines the measurement method; only then should you compare range, specified accuracy, display and power supply. For simple direct measurements, manual measuring tools may be sufficient.

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