3 1/2- vs. 4-digit digital indicator ? Exactly what is a 1/2 digit?

Besides 3- and 4-digit digital indicators, there are also 3 1/2-digit indicators available for sale. But exactly what is a 1/2 digit?
A full digit can indicate all numbers from ?0? to ?9?. A 1/2 digit, in contrast, can only just display a ?1?, a number ?2? or higher isn’t possible. With a 3 1/2-digit digital indicator, the indicatable range of values is thus significantly limited in comparison with a 4-digit indicator.
Thus, on Strong , the utmost of the indicatable selection of values is 1999 instead of 9999. However, no negative values could be indicated, since the minus sign can’t be displayed in the first position. Therefore, the minimum of the indicatable range of values is 0 rather than -1999.
An exception to the limitation of the indicatable negative value range is represented by indicators which have another space for the display of the sign. Displays with this characteristic can therefore also indicate values right down to -1999.
Number of digits
3-digit indicator
3 1/2-digit indicator
4-digit indicator
Representation
Max. scale range, standard
-199?999
0?1999
-1999?9999
Max. scale range with separate sign
-999?999
-1999?1999
-9999?9999
Max. amount of positions after decimal point
2
3
3
Note
More information about digital indicators from WIKA can be found on our website.
See also our article
Characteristics of the display of an electronic indicator ? there you will discover general information on the main characteristic top features of the display of an electronic indicator.

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