The chief features of a digital level are:

• A CCD (Charged coupled device) at the plane of diaphragm. It captures an image of the rod and processes it resulting in a rod reading and a distance to the rod.
• A data collector which keeps the level notes, performs checks and keeps a record of every rod reading and elevation automatically.
• A bar-coded rod having a scale represented through a series of bars of different widths. Bars are spaced constantly or variably. The spacing and width of the bars denote the code.

Advantages of digital levels include the speed of leveling, the virtual elimination of rod reading and calculation errors and the accuracy in reading rod.

Limitation of digital level lies in its range. Beyond a certain limit it is to be used in “manual mode”.

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