My Eagle Tree data recorder cost a lot more than something like this does and my recorder only does one thing, record onboard data. This is something that will record volts and amps (watts) onboard but also function as a lipo checker as well - for multiple lipos. The Powerlog version includes and optical tach for prop and blade rpm.

It perhaps has more utility on the plane/heli side ofthe hobby where you really need to know what kind of wattage you're setup is pulling.


Or do I have the nature of your question wrong, are you questioning the need for the measurement(s) to start with?