Just when you thought you knew everything there was to know about Turbine meter measurement, wham, out comes a revised AGA 7 standard. Now those basic principles are all still valid but maybe those operating practices we have built into our operating procedures need a little review. Rather than proceed as generations have done before us, research has been completed on the meters, their installation and operating practices and the way we calibrate and field test them. So now we have some data to back up our methods and madness.