The CAS SW Series Food Scale comes in multiple configurations to suit any type of application. All versions of the CAS SW scale are Legal For Trade, but there are three main lines. The first series of SW scales are just standard portion control scales that provide cost effective, basic weighing functions. The second series adds an IP66 rating (Waterproofing) so they can be used in damn and wet environments. The third series features an RS232 interface to connect with POS systems.