2-Prong Vinyl-Coated Burette/Flask/Beaker Clamp with Swivel Boss Head, 4.25" Max Glassware_Glass Burettes supplying replacements when the originals

supplying replacements when the originals lose loft or split during repeated charging cycles

Life-size heart model opens into two halves to expose four chambers

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

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

and cochlear detail for auditory teaching

2-Prong Vinyl-Coated Burette/Flask/Beaker Clamp with Swivel Boss Head, 4.25" Max Glassware_Glass Burettes supplying replacements when the originalsSecures 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.