OK conceptually but somewhat flawed in the delivery. Crashes easily. Needs tweaking and a Help section.
It does what it says it should do
dpi calc it works fine. . .
Doesn't work on Nexus 7 (2013) with Lollipop App crashes right away. Won't start.
Pretty bad Ironically, this DPI calculator works badly on devices with a high DPI.
List the details of all USB devices attached to an Android device with USB host
Your smart light bulb will react to notification received by your Android device