LUX Light Meter Clearance Rotary-knob resistance substitution board offering

Rotary-knob resistance substitution board offering twelve discrete values from 33 ohms to 10M ohms with 4mm lead connections

polished with ground edges for image-formation experiments in introductory optics

and control strips for a fuller genetic-taste-perception activity

sized to dust evenly over paper or around a magnet to make field lines visible during introductory magnetism work

LUX Light Meter Clearance Rotary-knob resistance substitution board offeringThree range digital lux meter reading 100, 2,000, and 20,000 lux through a separate probe with a CIE photopic spectral response, sized for classroom illuminance and light intensity investigations.