Not a TriMetric, but for $20 might be worth trying out...

DrewE wrote:
The main problem I see with this unit (and many but not all of the digital DC ammeters available on Amazon etc.) is that it can only measure current in one direction. You can monitor battery charge current or battery discharge current, but not both with the same device, at least without an external switch to reverse the shunt sense lines.

I know there are several on the forum that have these, hopefully someone can chime in. It would be silly to have to put a switch in the shunt line to monitor the other direction.