The best tool we have, i think, is the energy profiler. However if you want to measure the measure the current and / or voltage at the pins you will need to wire up a dummy cable and take measurements with a meter separately from there. If it's any use, i've done this with a fluke meter on both the n900 & n9 but mainly the n900 and the built in current meter the bq27x00 module is far more accurate and fine grained a tool than a basic ammeter can provide