How+to+Read+a+Scale

How to read a Scale properly? How many digits do we need to read in order to receive the most specific and accurate answer? If you are curious about the answers for those questions, please read the following page patiently. Now let me introduce several essential terms which relate to our ruler:

(_from: http://www.yahoo.com/images) Now, I will introduce the procedur of reading the scale. First, we should know the defference between each numbered division. For examplie, 2---1= 1mm. Therefore the defference between each numbered division is 1mm. Second, ensure how many spaces between each numbered division then calculate the value of each space. For example, 10 spaces between numbered division. 1/10= 0.1mm Therefore the difference between each unnumbered subdivisions is 0.1mm. Next，ensure the numbered division and the unnumbered subdivision, and predictict a propore uncertain digit. What should we do if the value is at the numbered division or unnumbered subdivision? then, we just let the uncertain digit be a zreo（ 0）！
 * 1) **Numbered division** : the division which is numbered such as 0, 1, 2, on the ruler.
 * 2) **Unnumbered subdivisions** : the shorter line in between numbered division.
 * 3) The space between the two numbered divisions is **the difference between numbered divisions**.
 * 4) The space between the two unnumbered subdivisions is **the difference between unnumbered subdivisions**.
 * 5) **Calibrated divisions** are both numbered division and unnumbered subdivisions because those scale are shown on the ruler.