Personalized wood digital scaleThe Smart tea ruler with electronic scale tea holder coffee scale is a must have for any tea enthusiast. I love this innovative design and minimal style of the tea ruler, in tea ceremony, different tea require different quantities, this smart tea rule makes it way easier. Functions of different tools: Tea Rule ( Ch H): An unlidded container used to first display the dry tea leaves, and then to slide these into the teapot. Often made from bamboo.