Demonstration Meter Included_Rod letting instructors tailor voltage to

letting instructors tailor voltage to light sources and experiment-specific requirements

Larger 125-millimeter slotted screwdriver with a 4mm tip and durable plastic handle

dimensioned as the matched replacement carriage for the LED ray box (PH0602ALED) track when an original rider is lost or damaged

and ray-tracing demos

Acrylic bell-in-vacuum jar with an internal 4-6V DC electric bell that fades and falls silent as the enclosed air is removed

Demonstration Meter Included_Rod letting instructors tailor voltage toPermanent magnet moving coil meter mounted in a transparent wooden box with all internal electrical connections visible, sized so students can see the moving coil mechanism while it reads.