I still don’t have a perfect solution for recording harp (except to use an electric harp)!
But I had a student who recommends the H2-Zoom – it’s very portable and cheap, and good quality. Like with all technology there is a bit of a learning curve – it is VERY sensitive to sound, and sometimes records things that are barely audible. Many musicians use them and recommend them.
If you’re looking for loopers which can instantly record and playback music, you’ll learn a lot from my Looper Lesson mini-course which everyone can access here: https://www.hipharp.com/academy/ll-looper-lesson-overview/