59b26e9d_SDK_Basics__Description
[Key] InRange [Data Type] Boolean [Description] 
A boolean set to TRUE if there is a barcode in range in the viewfinder. This key may be used to advise the user to hold the phone steady while a barcode is read. Not all devices require this guidance in order to successfully read barcodes – be sure to test on non-focusing cameras to see this key in use.
SDK Basics
Description