How fortuitous that a ruler has 12 inches and 31 cm. Those two numbers also happen to be the number of months and days in a year making it as perfect for a calendar as it is a ruler. There are two colored magnetic circles included with this metal ruler to mark the day and month. So whether you have a need to know the current date or the length of anything, both can be met with this single product.
Product Page (£15.00, about $24)
