The rulers are available for 11, 14, 16 and 18 count Aida type fabrics, these can also be used on evenweave by halving the count (i.e for 32 count evenweave use the 16 count ruler, for 28 count use the 14 count ruler etc.)

Once you have downloaded the sheet with the rulers on you can cut these out and stick them to a piece of card to give them some strength - laminating them also works well.

Finally, in case your computer tries to rescale the images when it prints them, there are two 'standard' rulers (one in inches and one in centimetres) that you can use to check the print out is the correct size.