Reading Magnifier, 60mm, 10cm Focal Length, Alternate Model Capacity_3000mL supplying precise low-resistance values for

supplying precise low-resistance values for Wheatstone-bridge and Ohm's-law investigations

5-ohm reference coil non-inductively wound from constantan on a 43mm ABS-supported bobbin with three 4mm sockets

dropping into the demonstration meter as a 0-1A AC ammeter for transformer and household-current measurements

viewable between clear plates so students watch sprocket teeth grip and transfer torque under load

a 75mm-aperture convex glass mirror at 75mm focal length and ~2

Reading Magnifier, 60mm, 10cm Focal Length, Alternate Model Capacity_3000mL supplying precise low-resistance values forDrops the focal length to 10cm on a 60mm aperture in alternate model framing, the shorter focus delivering more magnification at the cost of field of view.