Meet the RYOBI Laser Level Device: a handy tool that combines with your iPhone to help you find level and customize angles. It turns your smartphone into a cross hair laser level and uses sensors for level detection. The device displays images and measurements on your smartphone screen. The RYOBI Laser Level plugs into your headphone jack and displays information on your smartphone. The companion Phone Works app lets you capture, store and send data/images. Like what you see? Sets you back under $40.