> For the complete documentation index, see [llms.txt](https://sharinghub-eng.kittenbot.hk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sharinghub-eng.kittenbot.hk/functional_module/ph/phtune.md).

# pH Meter Initial Tuning

or new sensors or sensors that have been inactive for a long time, KittenBot recommends to go through the Initial Tuning process to ensure accuracy.

#### This process is only required once, it is not needed to run every time before using.

Download the following program.

{% embed url="<https://makecode.microbit.org/_gmJbuk5UbHEs>" %}

[Sample Program](https://makecode.microbit.org/_gmJbuk5UbHEs)

### A screw potentiometer is present on the adapter, use a small flat head screw driver to turn it.

![](https://kittenbothk.readthedocs.io/en/latest/_images/ph2.png)

### Remove the protective casing and submerge the module into the PH6.86 solution and wait for a minute.

### Turn the potentiometer clockwise if the Micro:Bit shows an Up Arrow.

![](https://kittenbothk.readthedocs.io/en/latest/_images/ph_calibration_1.png)

### Turn the potentiometer counter-clockwise if the Micro:Bit shows a Down Arrow.

![](https://kittenbothk.readthedocs.io/en/latest/_images/ph_calibration_2.png)

### Slowing turn the potentiometer until a Circle is shown.

![](https://kittenbothk.readthedocs.io/en/latest/_images/ph_calibration_3.png)

### pH Initial Tuning Demo Video

{% embed url="<https://youtu.be/SqBIiA1muCE>" %}