I recently purchased a Rees Morgan Meadow double strung concert lap harp. It is light weight and ideal for harp therapy as well as many other performing opportunities. It has sharping levers on the F B and C strings.
This is a truly sweet little harp. Playing it is somewhat of a challenge if you try to look at the strings while you play. But if you have any sense at all of where you are on the harp and have your melody or the right hand memorized, the right hand can pretty much take care of itself after a few trials. It’s harder to tune than to play, really.