Package of 3 singlepole singlethrow (SPST) knife switches for physics labs and classroom demonstrations. Key benefits Clear, visible switching action for teaching: the knife design makes it easy to show how a single connection is made and broken in a circuit. Lightweight and compact for classroom use: easy to handle, mount, and store for school demonstrations and student projects. Reliable contact for experiments: engineered to provide stable closure and consistent electrical connection when used in lowvoltage physics setups. Insulated construction for typical lab conditions: exposed conductive parts are limited to the knife contact so the switch can be used as an accessory in circuit experiments without unintended conduction when open. Pack of three: multiple switches included to support group work, multipoint demonstrations, or expanded experiment setups. Function and compatibility Function: singlepole singlethrow on/off switch for making and breaking a single electrical connection in a circuit. Compatibility: designed for school physics experiments, student lab benches, and educational project kits that use lowvoltage circuits. Intended use: demonstration prop for teaching the principles of physical circuits. Not intended for household wiring or continuous power applications. Practical attributes Form factor: lightweight and compact for easy integration into classroom rigs and portable experiment kits. Performance: smooth manual operation with clearly defined open and closed states suitable for demonstrative switching tasks. Materials: conductive knife contact combined with insulated mounting and terminals to focus conduction at the contact point during closure. Use scenarios Classroom demonstration of series and parallel circuits, showing live switching behavior and circuit continuity. Student lab projects where learners build and test simple circuits, enabling repeated onoff switching during measurements. Prototype or bench experiments in educational workshops where a visible, manual switch is required to control a single circuit line. Contents Three SPST knife switches packaged together for classroom and educational use. Note Designed specifically as educational equipment for physics experiments and demonstrations and not for daily household electrical use.