caption: The image shows a small oyster shell on a gray surface next to a ruler and a piece of paper with a QR code on it. The oyster is a light brown color with a smooth, glossy texture and a few small ridges along its length. The ruler is a standard measuring tool with a black handle and a white body. The paper is white with black text and a barcode printed on it, and the QR code is located at the bottom of the image.