hi,
the wiring diagram #2 is not suit for your item, please check this image
hope this can help you.
best regards

hi,
the “KEY” terminal is for shutdown.
hope this will help you.
best regards

hi， please check the following image

hope this will help you.
best regards

Hi, Michael

could you please Try the following operation

——————-
Memory Mode:
Long press S1 key for 3 seconds, the module automatically remembers the current work status as the default power-on state.
[0]means boot default display input voltage
[1]means boot default display output voltage
[2]means boot default display input/output voltage alternately
——————-

looking forward to hearing from you.

hi, Catherine

this item power by DC 7-30V voltage.
so you just need connect to your car 12V or 24V battery.

Red: Postive +
Black: Negative –

then it will work. if you want to monitor the car temp. it is better that avoid the sunshine, the car heating parts, install at a inconspicuous location.

thanks

hello,
if you want to open this case, you have to screwing out the four gold pillars, and tear up the white tags, and then you can see the four screws, and unscrew them.
so you can open the case.
hope this will help you.
best regards

Dear Mark and Blake,
Sorry for the delay. Here is the wiring instructions for the DC 100V 10A meter:
——————
Black line (thin): vacant or buck circuit (module) negative
Red line (thin): power supply+
Black line (thick): COM, common measuring
Red line (thick): PW+, measuring terminal voltage input positive
Yellow line (thick): IN+, current input+
——————————–

And below are diagrams:

We are sorry that if you still cannot read the correct values, please send us the test image and tell us more details about your devices and wiring.

Regards,
DROK