Concave Glass Mirror, 75mm Diameter, 150mm Focal Length Pack Size_14 closing the circuit only while

closing the circuit only while the button is held to introduce momentary-contact behavior alongside latched switches

Class-visible 12-inch demonstration meter with magnetically damped moving coil and Perspex front-and-back panels

integrating with standard projection setups for formative assessment and active engagement

Standard-length 300mm black 4mm-stackable safety lead rated to 12A with shrouded nickel-plated pins

Concave Glass Mirror, 75mm Diameter, 150mm Focal Length Pack Size_14 closing the circuit only whileConcave glass mirror at 75mm diameter and 150mm focal length on a ~3mm thick blank, the f 2 geometry balancing throw and magnification in introductory reflector optics.