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.
If youâre looking to dip your big toe into the sour game, pretty much any beer in their line will offer a window into this tart world. 5. Upland Brewing Sour Reserve Upland started their barrel-aging program back in 2006 with only four red wine oak barrels, and has since expanded to offer nine sour beers. But their Sour Reserve may be the boldest of the bunch. The unabashed sourness of this beerâwhich is a blend of a variety of different brews rested in barrels of various ageâmay be the boldest on this list.