This easy to use and economical clamp on tub bar will provide balance support at the tub.  This clamp on safety rail is one of our favorites.

Clamp it onto the side of your tub and use it for stepping in and out and support as you stand and sit on a bath seat.  Some people even use it for a balance assist at the toilet if the tub and toilet are adjacent to each other.  Weight capacity is 250lbs.

The easy-to-grip adjustable tub bar is made of a sturdy white powder-coated steel with multiple grip areas.  The top bar height is 14 3/4".  The clamp has non slip rubber pads to protect the tub and a large adjusting knob.  The clamp  adjusts from 3"-7" wide to fit most tubs.  This bar is completely portable and no tools are required for installation or use.  

Our therapist's tip:  Remember you need to clamp this onto a portion of the tub side wall that is evenly wide.  It will not hold well if you try to place it near either end of the tub where the inner wall starts to curve.    Also if you are using a tub transfer bench and swinging your legs over the side of the tub, a different safety rail or grab bar system will probably work better than a clamp on rail.  A clamp on rail may decrease the available space you have to swing your legs through.  The clamp on rails work very well with a bath seat!