Professional ruler can be used to measure length, angle,and designed to indicate whether a surface is level.
专业尺子可用于测量长度，角度，是否水平。
Professional ruler contains the length measurement, protractor, and spirit level
专业尺子包含长度测量，量角器，水平仪3种测量工具。
Professional ruler easy to use, features rich, it can instantly let your device with measurement capabilities. Is the network market the most perfect ,and the most accurate measurement tool.
专业尺子使用简单，功能丰富，它可以瞬间让您的设备具备测量功能。是目前网络市面最完美刻，最精确测量工具