So I have been playing with my x4 for a hour or so now and all I can say is that to get an accurate reading at less than 5mw is very hard.
So I ended up finally getting accurate reading on my two laserglow's with the x4 heatsink and laser as close together as I could get them, less than an inch. I had this setup in a box to eliminate air movement. I powered the x4 off of a USB battery pack so there was no wires running out of the box.
Final result is my libra tested an average of 3.6mw and
peak 4.1mw and my anser tested 4.2 avg and 4.7 peak.