The Natural History ruler is made of FSC-certified wood and is 30 cm long. It has a scale on the back in both inches and centimetres. The inch scale is divided into eighths of an inch (1/8), while the centimeter scale has increments of 5 millimeters.
The front of the ruler shows a timeline of the evolution of the major groups of plants and animals on Earth-from single-celled organisms and bacteria to mollusks, fish, plants, insects, reptiles, dinosaurs, and mammals to humans. Above is a timeline ranging from about 3 billion years ago to 50 million years in the past. Also included are silhouettes of each major plant and animal.
- Imported from the UK
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