Hello Jerud Crandall,
Thank you for writing in.
Could you please tell us your order ID or the link of the product so that we can ensure which product you are interested?
Waiting for your reply.
Best regards

Hello Luca,
You’re welcome.
If there is any question, please feel free to contact us.
Looking forward to serving you again.
Best regards

Hi robert swift，
Thank you for writing in.
000.3 is the base number of the meter,which cannot change it.
And the button on the back of the meter is used for adjusting voltage compensation.
When the driving load in the circuit is large.There will be voltage drop when wiring.At this time, the voltage

value displayed on the meter is not the exact output voltage of power supply.The voltage compensation function can

compensate voltage consumption of the wire so that can get a more accurate measured value of the output voltage of

the power supply.
When using the voltage compensation function, you need to connect a 5-digit multimeter to the output of the system

power supply.In the case without power, press and hold the button and then power the meter. At this time, the

ammeter will display [**].** is the stored voltage compensation level (the default value of ** is 00,i.e. no

voltage compensation).Then release the button, it will display–**.
When display–**, you can set the voltage compensation level. Connecting the large load to the circuit(it is

recommended that the current of the load is more than 2A, the voltage compensation value will be more accurate). Short pressing the button can increase 1 level. The max. level is 99. Adjust the value of the level until the voltage displayed on the meter is the same as the multimeter. Long press for more than 2 seconds to store the value. After that, the meter will measure the voltage with voltage compensation. If you want to turn off the function, you can set the voltage compensation to 00 level.

This meter is well-calibrated before shipping to Amazon warehouse, which cannot be calibrated by yourself.

Hope this can help you.
Best regards

Hello Luca,
Thank you for your reply and so sorry for our late reply.
The operating voltage range of this product is 15V-34V.
It is recommended that the voltage of the power supply is 24V.
If you need large power, it is better that you can use 24V power supply with more than 5A output current.
The polarity of the power jack is that the middle is positive and the outside is negative.
Hope this can help you.
Best regards

Hello Chad,
Thank you for your reply.
So sorry that the package of this product does not include the TTL connector and we do not have the connector for sale.
We must apology for the inconvenience caused on you.
Beg your forgiveness and understanding.
Best regards

Hello Thomas,
Thank you for writing in.
So sorry that we are not sure what you want to use this meter to measure.
Could you please tell us more details of your operation?
And here is the datasheet of the product, please check it.
DATAHSEET_100153
Hope this can help you.
Best regards

Hello Khaatim Gatlin,
Thank you for writing in and so sorry for the inconvenience caused on you.
Could you please tell us more details of your operation, such as the input voltage/current, the load, the wiring, the load, the working environment?
If you can, we sincerely hope that you can send us some images to let us check the problem details.
With your help, we can find a solution more quickly.
Best regards