Hello Muhammad Asif,
Sorry for causing you misunderstanding.
The voltage calibration do not need to use the potentiometers in the transformer.
For the current calibration, it needs to use the two potentiometers.
Best regards

Hello Paul,
The third setup mode is used for setting voltage alarm threshold.
When the measured voltage is over the measured range, the backlight and the voltage will flash to remind you.
Instruction of the Key button:

1.Backlight control
Short press the key to turn on or off the backlight, the backlight has memory function, it can store the on or off state when power off.
2.Reset energy
Step1: Long press the key until the power display area display “CLr”, then release the key.
Step2: At this moment, the energy is flashing to prompt this is the energy reset state, if short press the key again, then the energy value is cleared and exit the reset flashing state.
Step 3: If there is no operation within 5 seconds, it means the energy value is not cleared and will exit the reset state.
3.Set voltage alarm threshold
Step1: Long press the key until the power display area display “SET”, then release the key.
Step2: After enter this state, the voltage area display the current high voltage alarm value, the current area display the current low voltage alarm value and the last digit begin to flash, then you can short press to plus 1, when there is no operation over 3 seconds, it will switch the digit position automatically, from the high voltage alarm value to the low voltage alarm value, there are total six digits, the range of the voltage alarm threshold is 6.5～99.9V;
Step3: After finish the setting, long press the key until the screen display “PASS” ,that means you set successfully and will exit the setting state automatically.

Hope this can help you.
Best regards

Hello Colin,
Thank you for writing in.
Sorry that since many products is with similar titles, it is hard for us to ensure which product you are referring to.
Could you please tell us your order ID or the link of the product?
With your help, we can find a solution more quickly.
Best reagrds

Hello Robert,
Thank you for writing in.
This product is DC buck voltage converter.
Therefore, the output voltage must be lower than the input voltage.
If the input is 12.3V, the output must be lower than 12.3V and it will not go up to 15V.
Hope this can help you.
Best regards

Hello JohnFC,
Thank you for writing in.
Here the PDF file is the Datasheet of the product:
DATASHEET_090947
Hope this can help you.
Best regards

Hello Bill W,
Thank you for writing in.
Here is the datasheet of the product, please check it:
Input voltage range: 12-22V (Adjustable)
Output voltage: 9V (Fixed, the lowest differential pressure is 2V, the output voltage should be 2V lower than input voltage)
Output current: 2A (Max.)
Output power: 18W
Conversion efficiency: Max 95%
No-load consumption: 10-12mA
Working temperature: Industrial-grade (-40 °c to +85 °c)

Features:
Overcurrent, overtemperature, short circuit protection
Waterproof, Dust-proof, Shockproof, Suitable for all kinds of harsh environments
Small size: 35×25.5x21mm (do not including install ear)

Hope this can help you.
Best regards

Hi Paul,
Thank you for writing in and your detailed description.
Could you please send us some images of your wiring to let us check the problem details?
With your help, we can find a solution more quickly.
And here is the wiring diagram of the product, please check it:

Hope this can help you.
Best regards

Hello Kirk,
Thank you for writing in.
Here the PDF file is the instruction of the product:
Instruction_200180
Hope this can help you.
Best regards