Set 1: Length, Angle, Slope, Level, Thread - Smart Ruler Pro
Set 2: Distance, Height, Width, Area - Smart Measure Pro
Set 3: Compass, Metal detector, GPS - Smart Compass Pro
Set 4: Sound level meter, Vibrometer - Sound Meter Pro
Set 5: Flashlight, Magnifier, Mirror - Smart Light Pro
For more information, see the manual for each of the apps, watch the YouTube video and visit the blog: http://androidboy1.blogspot.com/
Do you want to get more tools and features? Please send an email. I'll reply to it ASAP.
I hope my apps are useful to your SMART Life. Thank you.
* Off-line support (for Wi-Fi only Tablets) : Open this app several times with internet, you can open it without internet.
** A magnetic sensor is required. So this app cannot support several android devices (e.g HTC Desire X).
*** This app had been published only on Google Play and Androidpit (not Amazon app store).