@vees Depending on the exact mix of power source and device, insufficient current to operate properly, or bad handshaking. I have a couple that look identical to yours (but that means nothing of course) that I usually use for everything except C, and another one just for C that has a BT connection for data collection and also internal memory for longer term stats.
FWIW I've seen nothing but accurate measurements and bidirectional handshaking with this one. I have a similar display on my Xtar PB2S battery pack that shows negotiated numbers for voltage and amps within 5%.
The Shenzhen factories probably rotate out chipsets every week based on JIT delivery pricing and as luck would have it I got a good one.
@vees That's the underlying problem. Even buying the ostensibly same device from the same source at the same time doesn't mean you'll actually get the same thing. However, I do like having that dedicated USB-C device, it was relatively inexpensive but far more capability than the starfish units.
@vees One really cool feature of my C unit is that you can optionally provide power for the unit itself from a separate source, meaning the device readings are even more accurate. Very neat.
@lauren What's the model of the one you have? TBH I only got this because I was trying to diagnose a USB-C motherboard problem where the laptop wouldn't post but the USB-C was still taking and delivering power (which was wild) but all I had to test was my earlier mentioned PB2S and I figured there were better tools out there for the next time.
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