Banggood Dear Customer, Thank you for choosing Banggood and sorry for your any inconvenience with the product. There is an instruction about how to use the product on the product page, you could kindly check for it. If you have any suggestions or require our assistance, please do not hesitate to contact us via these links: Personal Computer: http://www.banggood.com/Contact-Us_hi111Mobile: https://m.banggood.com/contact_us.html. We are glad to help you to solve the problem and give you a proper solution as soon as possible. Thanks for your kindly understanding. Best regards, Banggood Team

عرض

gdkornfeld2 Theon-line instructions aren't going to help since the two scales are superimposed on one side of the ruler making both illegible. You can see this in the photo.

عرض