Anyone use this power analyzer? Looking for recommandation

[electrocean]

A power monitor comes from a company named Rejoe. 12V Max output voltage, μA precision, 10kps sample rate, and come with desktop application.

Does anybody use this product, how is its quality, does it fit the description?

I am working on a smartwatch project, trying to focus on long standby time, and I found myself lack of a precise power analyzer. Any recommendation?

Thanks for your time!