Gas measurement has evolved over the last few decades from simple paper chart recorders to sophisticated electronic flow computers. That evolution came about because of technology advances that allow systems to do much more with less power. That power requirement is dictated by the nature of gas exploration and production. Inevitably, natural gas will be found in extremely remote locations. The remoteness of these locations causes many problems that must be overcome by technology. The most elemental of those hurdles is the lack of on site power