MiniTrak scanners for web measurement and control are easy to maintain and use. The same fundamental cross-web beam design can be used for reflectance and transmission gauges. The beam's outer shell houses the mechanical and electrical components. Optional features include purging or explosion-proofing systems to allow operation in dirty or hazardous environments. NDC Infrared Engineering Inc., Irwindale, CA, U.S. +1 626-960-3300; www.ndcinfrared.com.