3" (75mm) Magnifying Glass with Plastic Handle Measurement_Stopwatches & Timers this silk square gives friction

this silk square gives friction rods a strong positive charge for triboelectric and electrostatic demonstrations

AC/DC switchable low-voltage power supply outputting 6V or 12V at 2 amps from a 110V mains input

and true/false classroom polling

Pair of Alnico bar magnets supplied with steel keepers in a cardboard box

the pivoted magnet arm engaging or disengaging the induced drag on command

3" (75mm) Magnifying Glass with Plastic Handle Measurement_Stopwatches & Timers this silk square gives frictionThree inch (75mm) magnifying lens on a 6. 75 inch unbreakable plastic handle, sized for reading, close inspection, and image formation experiments in introductory optics.