As I have already posted here,
I saw eight Konnwei KW681 OBD-II scanners in a Goodwill Store priced at $7.99 each.
These were still in shrink wrapped boxes.
The box said they were also 12 volt lead acid battery testers.

I decided to risk buying one.
I had never heard of Konnwei.

The battery testing involved many different USA, Euro, DIN, Japanese, and China test procedures.
They all seem to be able to rate new good batteries, from older still good batteries, to a bad battery with one shorted cell with sulphation.

The OBD-II could detect DTC, erase DTCs,
and show “pending” Mode$07 DTCs yet to turn on the dash trouble light.

Sensor outputs could all be displayed and auto-updated every few seconds.

There is an oxygen sensor pass/fail test.
There is an alternator ripple voltage test.

It showed me a general P0700 transmission code, and a P0755 sub code..

It tells me there are two PCMs, and I am guessing the second PCM is the transmission computer.

I tried, but could not find out how to read CVI, or “Clutch Volume Index”.
It may be possible, but the instruction book is not well written.
The Chinese section of the book seems much longer,
and when my fluent Chinese speaking niece next visits I am going to ask her if there is more info.

There is a micro USB port for updates.

Well worth $8,
and I wish I had bought a couple more.

Konnwei makes more than a dozen different models,
says the advertising flyer with pictures in the box.