The fourth (yellow), is for touchscreen calibration.
The touch screen offers access to features like calibration options, chronograph and a thermometer.
Not only does this bad boy have an alarm, a calender, a stopwatch, and world time for 30 cities, but it's also solar powered and receives time calibration radio signals to make sure the time is always accurate.
However, since this is an area that may require delicate calibration -- especially if you're on prescription meds -- you should always consult with your doctor before embarking on self-medication with chromium.
By using hexadecimal notation, this can be exact regardless of the screen calibration or even color blindness of the people working on it.
These definitions provide a basis on which the calibration of amperemeters can be conducted.
The accuracy of a meter is tested by drawing calibration curves showing the percentage departure from absolute accuracy in its reading for various decimal fractions of full load.
The calibration of ammeters is best conducted by means of a series of standard low resistances and of a potentio meter.
This can be determined by a direct calibration, by inserting a known quantity of water at a known temperature and observing the contraction, or weighing the mercury drawn into the apparatus.
After this event the Calibration Curve.