For ranging beacons, which class i have to use?

In Estimote SDK 3.0, when i am using ESTSecureBeaconManager class ranging method not working fine, ipad cannot find beacons. if i use ESTBeaconManager ranging working fine. where we have to use ESTSecureBeaconManager?

Secure Manager is for detecting beacons that have Secure UUID turned on.

You can read more about Secure UUID here:

What security features does Estimote offer? How does Secure UUID work?