Demonstration Meter Included_Rod and organelles with hand-painted detail

and organelles with hand-painted detail on a mounted base for biology teaching

used to extend the activity-series comparison and to introduce the chemistry of the lead-acid battery

Engineered to expose both AC and DC generation on a single hand-cranked apparatus

Acrylic bell-in-vacuum jar with an internal 4-6V DC electric bell that fades and falls silent as the enclosed air is removed

Demonstration Meter Included_Rod and organelles with hand-painted detailPermanent magnet moving coil meter mounted in a transparent wooden box with all internal electrical connections visible, sized so students can see the moving coil mechanism while it reads.