This is likely a rice measuring tool from about 50 years ago. It reflects light, making it difficult to photograph well. It indicates the water levels for "firm," "standard," and "soft" rice. Size: Approximately 17.5-18 cm (length) x 4 cm (width) The length is approximate as the bottom is not a straight line. There is some deterioration due to age, so I hope those who can appreciate it as a historical item will consider purchasing it.