SmartStrip is a tool that measures the volume and temperature inside the keg. When applied to the keg wall, it reads remaining beer contents and temperature using liquid crystal technology. Apply to a clean, dry keg. Simply place the SmartStrip with its repositionable adhesive backing on the keg. Activate by spraying with hot water and wiping with a cloth. Current beer level will immediately appear. Temperature reading is always available, no activation necessary.