# Understanding the problem

At first, for the most watermeters the default configuration should be work. But the digit, especially the last digit differs in some devices.

## "Normal" transition

In most cases, the transition of the last digit starts when the analogue pointer is > 9.

Often the last digit "hangs" a bit on this devices and comes not over zero. So it is not easy to see which digit is correct. In the first example 4 or still 3? (3 is correct).

## Early transition

Some units start the transition very early or run with the analogue pointer. In the third example, is it a 3 or a 2?

## Inaccuracies in image recognition

The models for image recognition are good, but have inaccuracies in the range +/- 0.2. In order to obtain as many correct results as possible, a treatment is carried out in the post process in the range of 9.8-0.2 for the analogue pointer, which must start differently depending on the type of counter.

## How to configure for my meter type

If you have a devices with "normal" transition you should not have any issues. On devices with "early" transition, you can set the option `AnalogDigitalTransitionStart` to a value between 6 and 8.

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