Pyrex 9985-125 Watch Glass - 125mm Laboratory Glassware (Case of 72) - Perfect for Chemistry Experiments, Science Labs & Classroom Demonstrations

These watch glasses provide high chemical durability, preventing contamination of solutions. They are modelled to the same radius of curvature for convenient stacking. The heavy wall an uniform fire-polished edge provide mechanical strength. The outside diameter cannot be controlled within close limits and a slight degree of out-of-round can be expected to occur.