pretty dang sweet
I have some charging issue with my 83 R65LS, which I'm being real lazy about properly diagnosing. I bought this initially thinking it would just let me monitor voltage drop over time without having to pop the seat and poke the battery with a multimeter, but in fact the device+app provides cranking and charging tests. Cranking test shows cranking voltage (and it sounds like simply says GOOD/POOR at a 9.6V threshold). Charging test has you start the engine, turn off all devices, but leave headlight on -- though I haven't tried this yet (I told you I'm lazy about diagnosing my problem).
Also worth noting, this painlessly paired via bluetooth with my iPhone, no problems at all here. I just followed the included printed instructions on downloading the app and pairing.
For $43 this seems like a hell of a device -- I ordered around the same time a digital battery load tester for 1.5x the price of this, and that's something I gotta hook up each time, and it's sure not gonna talk to my phone.