Optically Worked Double Convex Glass Lens, 75mm Diameter, 1000mm Focal Length Material_Brass and aluminum at a shared

and aluminum at a shared 0

the workhorse decade for introductory Wheatstone-bridge and Ohm's-law work

and classroom projects

Plastic-bodied wave apparatus with eccentric discs that drive metal rods up and down as the handle turns

holding pH stable at 25 degrees C for calibrating meters and electrodes at the standard low-acid reference point

Optically Worked Double Convex Glass Lens, 75mm Diameter, 1000mm Focal Length Material_Brass and aluminum at a sharedDesigned for parallel beam refraction work, this 75mm double convex glass lens at 1000mm focal length runs at f 13, near collimated for astronomical analogue and long throw projection setups.