The 4200 FlexScan Series FTIR (handheld) is a dual module system the optical module weighs 3 lbs and it is attached to the 4 lb electronics module by a power cable. The electronics module can be worn on a belt or in a shoulder pack. The 4200 analyzer uses the same interferometer and optics as the 4100 ExoScan and thus has identical performance. The 4200 FlexScan is for dedicated field applications and has a fixed sampling interface that is specified when the system is ordered. The light weight of the hand-held optics and sampling module make it well suited to repetitive infrared analyses over a large area, or numerous measurements over a large object.