I use this on my bike, my car, and my scooter. All I do was walk up to the car and it instantly starts reading my battery voltage. It works perfectly. Just passing on a nice mod, and adding a little content here.
https://www.amazon.com/gp/product/B06Y5PC9D8/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B06Y5PC9D8/ref=oh_aui_search_detailpage?ie=UTF8&psc=1