Curved Nylon Flask Cleaning Brush, 15" Glass Flasks_Volumetric Flasks - Class B Wall-mounted Mason's hygrometer with two

Wall-mounted Mason's hygrometer with two identical dual-scale thermometers — one dry and one kept wet via a water reservoir — calculating relative humidity from their paired reading difference

Open-top cylindrical dropping funnel in borosilicate glass holds 50mL with PTFE key stopcock for controlled liquid addition in chemistry procedures

Compact 42-cm resistance investigation board

Optically-worked glass double convex lens with a 150mm focal length and 1

Curved Nylon Flask Cleaning Brush, 15" Glass Flasks_Volumetric Flasks - Class B Wall-mounted Mason's hygrometer with twoBristled along a stainless steel twisted wire handle, this curved flask cleaning brush scrubs the rounded interior of beakers, flasks, jars, and vases up to 6. 25 inches across.