Along with a portable air compressor, a pair of jumper cables, an OBD2 scanner completes the trifecta of things you should ...
you can perform an accurate diagnostic in a matter of seconds. Unlike your standard multimeter, the Ancel BA101 can put a controlled load on the battery to assess its ability to maintain voltage ...
Ancel is one of the more reputable names in the diagnostic space ... will set you back hundreds of dollars less than a dedicated tool with a built-in screen and similar set of features.