Banner Engineering 43958-N Specified Test Piece For Light Curtain

STP-3 Specified Test Piece for Light Curtain, Banner Engineering, 1.75 inch diameter (43958) is a replacement test artifact designed for Banner’s MINI- and MICRO-SCREEN safety light curtain systems to validate the defined sensing area by obstructing a beam within that area. The part, identified by 43958, is a standalone, single-piece test object manufactured in the United States and sold individually; it is listed by multiple distributors as the standard Specified Test Piece for light curtains. Diameter specifications are noted as 1.75 inches (about 44.5 mm), with references also noting a 45 mm size in technical diagrams. While some listings indicate STP-3 has been discontinued by the manufacturer, it remains available from third-party suppliers as a replacement part.