Many NOx sensors work by first removing oxygen and then breaking down the nitrogen oxides to provide a reading. However, the NexTech sensor eliminates the need to remove oxygen; the sensor material is engineered to have a strong NOx sensitivity even in the presence of oxygen.
Sour beers are probably the oldest style of brew in the world, but they're just starting to get popular in the States. They were all the buzz at this year's Great American Beer Festival. And with hundreds of brewers now dabbling in sours, it's easier than ever to find them at a local bar or grocery store.
Sour flavors have most recently become a desired affection. Berliner weisse features a reserved lactic sourness as its keynote, the supplementary fermentation resulting in an effervescent, bone-dry beer, placing them among the most refreshing beverages, beer or otherwise. Rare even in Berlin, the recent general delight in sour beers has put them on our collective radar.