When acrylic rulers meet technology, you get something amazing–-the Glow Ruler! Perfect for fussy cutting and for squaring up, the lines of this ruler light up when you press the power button. It can also be used with the power off. Recharge with the included USB-C cord. The total size of the ruler, including the stainless steel base, is 6-1/8" x 6-7/8", with measurement lines up to 6" x 6".