2-Prong Vinyl-Coated Burette/Flask/Beaker Clamp with Swivel Boss Head, 4.25" Max Glassware_Glass Burettes Beech wood test tube rack

Beech wood test tube rack accommodates 13 tubes up to 25mm diameter in a 10

5 by 4-inch ventilation apparatus modeling historic mine-gallery airflow and domestic chimney convection through a candle-driven hot-air-rise demonstration

and connecting leads in one teaching package

Two Alnico cylindrical magnets each 4 inches long and 3/8 inch in diameter

2-Prong Vinyl-Coated Burette/Flask/Beaker Clamp with Swivel Boss Head, 4.25" Max Glassware_Glass Burettes Beech wood test tube rackSecures burettes, flasks, and beakers up to 4. 25 inches on a swivel boss head fitting 18mm rods, with screw adjustment tuning pressure to avoid cracking thin wall glass.