Not sure just what this would do.

[Pudsey Bear]

There is a video

https://www.amazon.co.uk/Koolertron-Voltmeter-Coulometer-Wireless-Motorhome/dp/B09Z64DWH7/ref=sr_1_23_sspa?crid=3GSSWD06YXIP8&dib=eyJ2IjoiMSJ9.rqlWtJSBhWeks35IWRUYDZSf_fEAfff9gTv-_fGH_bB-Hvui4ulDd3hk4ztaO8N_rxQLUFelkdVaqV24ti3LAeAP6F8yfJGh-XGjBQPyg7g.zahvkO4SRV-kaSYVnBgs6sfCpVsW44uUTvs1-25KNYQ&dib_tag=se&keywords=motorhome&psr=EY17&qid=1708510864&s=todays-deals&sprefix=motorhome%2Ctodays-deals%2C76&sr=1-23-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9tdGY&psc=1&m=A380ZQUTGHWD6J&SPES=1

 

[trevskoda]

Its a toy for battery watchers, just more cr-p if thats what you are into, a simple battery charge state monitor costing buttons will do the same job.

 

[Pudsey Bear]

I didn't say I wanted, not at that price., I have a little one that plugs in the 12v socket, tells me the volts, temp and amps on anything put in the two USB sockets.