1 X WS400 SERIES2 NON DIGITAL 1.3HD. 1 X LS400 SERIES2 NON DIGITAL 1.3ET. The all new WS-400 has been designed for compliant applications, OBS stands for Optimum Base coat Settings. LS-400 BASE: The new LS-400 Base is a unique HVLP Hybrid spray gun designed for the application of both water-borne and solvent-based basecoats.