2.125" Cast Iron Closed Ring with Boss Head Clamp Science at Home_Elementary Science the complementary-polarity counterpart to NPN

the complementary-polarity counterpart to NPN for push-pull and bias-network demonstrations

Highly-detailed digestive canal model isolates the GI tract from surrounding organs to expose mucosal and muscular layers along the full length of the canal

Largest metal displacement vessel in the series at 225 by 125mm with a side spout

Hand-cranked worm-and-wheel drive with a rotation dial between clear acrylic plates

Wooden-frame abacus on a 13

2.125" Cast Iron Closed Ring with Boss Head Clamp Science at Home_Elementary Science the complementary-polarity counterpart to NPNCast iron closed ring clamp with an integrated boss head, combining a 2. 125 inch outer ring and a thumbscrew rod grip from 5 16 to 5 8 inch for small apparatus support.