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Inspection of items or products can be done in two ways:

1. By attributes, using gages to determine if the product is good or bad, resulting in a yes/no, go/no-go decision.

2. By variables, using calibrated instruments to determine the actual dimensions of the product for comparison with the size desired.

In an automobile, a speedometer and oil pressure gage are variable types of measuring instruments, and an oil pressure light is an attributes-type of gage. As is typical of an attributes gage, the driver does not know what the pressure actually is if the light goes on, only that it is not good.

Variable types of inspection generally take more time and are more expensive than attribute inspection, but they yield more information because the magnitude of the characteristic is known in some standard unit of measurement.

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Q: Why have so many variable type devices in autos been replaced with attribute type devices?
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