RE: "Tower Pro" "Volt Watch"
The Voltwatch, IMHO, is a better device than most people seem to think. The biggest advantage is that it also alerts you to any dragging servos, binding pushrod etc. if you watch the LED's as you cycle the sticks. If you see it dipping into the red momentarily, you know that you have a possible problem in to small a gage wiring, a poor switch, something drawing excessive current for a moment or so or anything else that might cause momentary high currents. This can be catostrophic if you are using any of the 2.4GHz systems as a momentary voltage drop can cause the reciever to lose lock and have to reaquire communications (a second or more of lost signal). Loaded voltmeters are also nice and, if used before every flight, almost as good as a Voltwatch. Do not assume that ESVs are loaded however, some are not and read only open circuit voltage. Also, the voltmeters only check the battery condition and do not give you any information on the switch condition, wire current carrying capacity etc. that the Voltwatch does.