In Ruler-7, you can use a ruler, protractor and Vernier caliper for measuring operations.
Features:

• Convenience
• Easy adjust the color of the background, font size
• Simple and tailored interface
• choice of units of measure inch or centimeter
• Use the range can be from different angles thanks to the convenient scale
• Show grid.
• With these three essential tools the measurement process will be much simplified and will seem interesting!