Android 3g signal

Is there a good app for displaying 3G signal levels on Android? When signal is poor my Note3 displays a circle with cross symbol where the signal bars usually are while still allowing 3G to work. In that situation I'd like to have a good measure of signal strength (preferably better than a 1-5 rating) so I can find the best location available. Any suggestions? -- Sent from my Samsung Galaxy Note 3 with K-9 Mail.