The seed ruler is a great example - it helps when planting out seeds and small seedlings, giving perfect spacings for everything from peas and beans to cauliflowers.
This beechwood ruler has pre-drilled seed sowing holes with metric and imperial measurements.
Use the ruler with the dibblet for depth accuracy when planting seeds. Can also be used to bat off irritating husbands, and squash yucky slugs.
See its little brother for a smaller version.