Reading Magnifier, 75mm, 15cm Focal Length Science at Home_Math providing the lowest-value reference in

providing the lowest-value reference in the line for low-resistance Ohm's-law and bridge work

supporting identification-key exercises in medical and nursing anatomy training

and an 18mm attachment diameter for pulling small weights in mechanical-advantage experiments

Wooden-frame abacus with three U-shaped steel wires carrying 20 plastic beads each on a 13 by 6 inch base

Reading Magnifier, 75mm, 15cm Focal Length Science at Home_Math providing the lowest-value reference inLarger aperture 75mm lens at a 15cm focal length captures more of a specimen at a glance, the chrome plated metal frame and handle keeping the reading magnifier classroom durable.