So let’s get started using this app!
First we have to calibrate your device. Tap 
to start calibrating. You can calibrate your device using a ruler, paper money or even your credit / debit card. Follow the instructions and slide the red arrow to the correct place. You’ll only have to do this once
Setting your container:
Tap 
to set your container. You can use a round, square, rectangle or cone shaped container. Measure them using the red and blue arrow just as you did calibrating. Don’t forget the cone typically a glass needs both a top and bottom size and the rectangle needs a width and length size.
You are all set!
Now you can start using your jar and scale!