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Measurement Devices:

The right kind used correctly; Measurement devices are an absolutely critical link in getting quantitative knowledge. So, too, are the ways in which one uses them.

For instance it’s pretty much impossible to measure the thickness of a human hair with a yardstick (if you are metrically declined, or meter stick,if not). You have to use not only the appropriate measuring device, one that measures the parameter you need, (that’s pretty obvious) but also the appropriate version, one that is capable of resolving the least significant magnitude of the quantity desired (that’s not always obvious) and also one which has sufficient range to cover the largest expected value.

Obviously, one would be foolish to try to measure the weight of an adult African elephant with a bathroom scale; the range is too small. It just wouldn’t work.

These examples are clearly incorrect uses of measurement devices. Learning the correct way to measure, to select the appropriate device with the needed range, resolution and other important properties are part of the job of gaining “non-meagre” knowledge.

Those who do well in applying measuring devices to the real world measurement needs are aptly called “Application Metrologists” since they deal mostly with the use of devices. This is not a well-recognized discipline, but one that exists nonetheless.