I also like the Jowoom Smart Tuner T2. Each device has its own benefits. The Roadie 2 allows you to customize tuning and has a corresponding app. I like the auto mode on the Jowoom.
I tried one, but found it to be difficult to control and it didn't tune exactly, I still had to tune a bit by hand. Sent it back.
This is Michael Kohan in Los Angeles, Beverly West near the Beverly Center
9 tenor cutaway ukes, 6 acoustic bass ukes, 12 solid body bass ukes, 14 mini electric bass guitars (Total: 41)