This Eisco Labs Spot Plate is made from quality porcelain and features six wells, each measuring 22mm in diameter. The plate measures 4" long and 3.6" wide, with a glazed top and sides for easy cleaning. Spot plates are used for small-scale qualitative analysis, color comparison tests, and micro-reactions. The porcelain construction resists chemical attack and provides a white background for observing color changes. Suitable for chemistry classrooms and professional laboratories.