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Calibrating an instrument or device We need to calibrate instruments and devices to put a scale on them in the first place .To do this we need to compare it with a standard. We need to check the instrument or device is correctly calibrated so it is accurate. Examples of these are: *Clocks need to be accurate to tell the correct time * A speed dial has to be correctly calibrated so that the speed shown is correct and that accidents could be prevented *An altimeter would need to be correctly calibrated so that it would show the correct height on a plane, if this was not correctly calibrated the pilot would not know his correct height and may crash the plane. *Breath testers for alcohol to be correctly calibrated so that they can read the correct amount of alcohol on the breath. If these were not accurate then crashes would not be able...

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