I bought this arm to hold my iPad pro 10.5" along with the tablet holder which is a separate purchase. The tablet holder attaches to a gear at the end of the arm. However, this gear barely has enough resistance to keep the tablet in the position you want. If I row too hard, the tablet will fall out of position and end up facing the floor. It holds fine if I row gently, but sometimes I like to finish up with a good burst of exercise, and that's when the tablet swivels down. Tightening the bolts doesn't seem to make any difference. If you have a lighter tablet or a phone, this will probably work just fine.

It's a nice accessory and matches the water rower material well. The phone holder is pretty basic and getting a big phone like iPhone Max or Samsung Note to fit is pretty tight. The holder only adjusts up and down, so I replaced it with a ball mount and a iOttie holder which makes mounting and unmounting the phone much easier and provides more adjustment to the position of the phone. Overall, it's a nice accessory, just wish it had a better phone mount.