Function of objective lensin microscope

Pushbutton enclosure, Type 4X, RAL 7035 light gray inside and out, Polycarbonate enclosure material, easily punched, drilled, filed or sawed, Straight side walls permit ganging of multiple enclosures, Halogen free material, Used for insulating and housing 22.5-mm pushbuttons in hostile environments, Seamless foam in place gasket assures water-tight and dust tight seal.