Measure your fish, and check the thickness of ice with this handy ruler. Ruler is made of aluminum in Satakunta, Finland. The sticker is weatherproof and the lower limit of zander (42cm) is marked on it. One end of the ruler is bent, which makes it easier to measure the length of the fish and the thickness of the ice. Total length of the sticker is 50cm (1-2mm tolerance). You can put your hand in the string loop or tie a sufficiently large float to avoid ruler from sinking to the bottom of water!