Why set range and the minimum thermometer calibration?

Many people may have such a question, why at the time of using a thermometer to set up the range and the minimum scale? The answer is: in order to the accuracy of the instrument. A diameter of 100 mm thermometer, the maximum range of 360 & deg; C, the average degree of space distance is 1 degree Angle. At this time, its disk scale will be very crowded, may mark the font to a small, or every 10 & deg; C is a scale. At this time, if you use it to measure 85 & deg; Value of the temperature, the actual disk will be very inaccurate, and also is not very convenient when you are reading. : because of instrument manufacturing technology, the damping effects of instrument, measurement, pointer must be near the center value area, will be more accurate measurement results. In addition, the outrange thermometer, actually has lost its denotative meaning, also easy to cause permanent damage to the instrument. In this case, however, if a 100 - degree range of thermometer, minimum scale is 30 degrees, and disk diameter is 150 mm, the situation changed greatly, in value will be very accurate. By extension, digital thermometer, the D/A and A/D conversion circuit, bridge circuit and digital carry circuit, and pointer thermometer all roads lead to Rome. In view of this, the project selection of the thermometer must design its range and the minimum scale. Of course, for temperature is only reference data, don't have to. Is it solve the confusion of the heart?