Johnson Level & Tool RAS-120 12″ Johnny Square Aluminum Rafter, 12″, Silver, 1 Square

Customers find the square ruler to be a quality tool that offers good value for money and is useful for marking boards accurately. They appreciate its size, with one customer noting it can span an 8-inch plank, and its material, with one mentioning it's better than plastic. The ruler is easily readable, though opinions about its precision are mixed, with several customers reporting that it was not square.