For $8 bought a still shrink wrapped Konnwei KW681 at a Goodwill Store.
I had very low expectations it would even turn on. https://www.ebay.com/itm/3635030711...msclkid=006e32f356b81496a04f53b4d5ef5e4e
Tried KW681 this morning.
It worked, at least on a 2005 T&C van.
Has a built in battery tester too, which also seems to work and can do multiple types of load tests, SAE, DIN, Japanese JIS, etc.
Calculates CCA and internal battery impedance.
Graphs charging “AC ripple” above alternator DC voltage.
OBD-II read codes,
including mode $07 “impending error codes” where not enough faults have yet occurred to turn on the check engine light.
Not bad for $8