Watch Glass Set — 6-Piece Borosilicate, 75/100/125mm Pairs

Concave and versatile, the watch glass serves as a miniature evaporating dish, beaker cover, sample holder, and weighing surface — a deceptively simple piece of glassware with a dozen uses.

Placed over a beaker, a watch glass reduces evaporation while allowing gas exchange — critical in titrations and long-duration heating experiments. Used as a weighing dish, the curved surface cradles powders for analytical balance measurement. Borosilicate construction means it won't absorb reagents or warp under a heat gun.

• 6 watch glasses: 2× 75mm, 2× 100mm, 2× 125mm — 3 pairs
• Borosilicate 3.3 — heat lamp and hot plate compatible
• Fire-polished edges; uniform curvature for stable resting position
• Compatible as beaker covers for all standard Griffin beakers

Every purchase directly funds independent physics research at the Golden Physics Project.