Imagine you're on your way out to install a wind meter for your favourite location. Your first obstacle is finding a suitable position that is nicely exposed to the wind from all directions. Next is to make sure it's high enough so that surrounding terrain doesn't upset the reading .. oh, don't forget avoiding vandals, and then you've also got to get electricity and communications to it. Other needs include payment for securing a lease of the site, and how long it's available. What all this adds up to is that not all wind meters are in perfect conditions. Some will favour the most common direction, others have a wind meter but are more biased towards recording accurate temperature or barometric pressure. What we're saying is that if you're after perfection in measuring the wind, you're going to be disappointed (or at least a little bit upset). Best Bet: Over time, you'll learn how a particular meter close to your favourite spot behaves.