Here is a nifty tool that turns your smartphone into a cross hair laser level. The RYOBI Laser Level Device pairs with the RYOBI Phone Works mobile app to allow you to use your smartphone to find level and customize angles easily. It uses your phone’s sensors for level detection. The device displays images and measurements on your smartphone screen.
You just have to plug the device into your headphone jack to get started. The companion app turns your phone’s screen into a digital display to make your job easier. You will be able to see measurement data and more. You can get yours for under $40.