Reading Magnifier, 100mm, 20cm Focal Length Material_Ceramic illustrating how differential thermal expansion

illustrating how differential thermal expansion makes and breaks a low-current circuit

this two-wire potentiometer mounts on a metal base for stability during extended laboratory measurements

letting students read image height and position directly off the projected real image during focal-length investigations

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Reading Magnifier, 100mm, 20cm Focal Length Material_Ceramic illustrating how differential thermal expansionPairs a 100mm aperture with a 20cm focal length for the lowest magnification in the chrome framed reading magnifier line, well suited where breadth of view matters more than zoom.