The UK Lash Ruler was launched and introduced to the Eyelash Industry earlier this year by Miranda Tarpey. What does The UK Lash Ruler do? The ruler has been specifically designed for Measuring the length of natural lashes. Care for your clients natural lashes. This tool will help you to choose the correct length to use on your client minimizing natural lash damage. The first eyelash ruler in the world! This is a disposable product.