Have you ever been in situation when you need a ruler or a gauge, but you don't have one on hand, and it is not only if you're a builder, we all need different tools in our usual life, and no you can have them all in one app - Multi Measuring Toolkit - Your Smart Measurer. Perfect tool for professional engineer or a student.
How to use: Choose the tool you need, ruler, gauge, calc or protractor, make notes and save them.
-All measuring tools in one app
-Easy to use protractor and gauge
-Useful ruler and calculator
-Possibility to make notes while measuring
Bug fixes and performance improvements
Calendar Planner Pro 
MaCleaner X 
Audio Toolbox Pro 