For sound healers, kirtan circles and meditation teachers outside India, RagaLoom offers handcrafted shruti boxes and harmoniums from its workshop in Noida, India. A shruti box gives a steady, hand-pumped drone with no electricity, ideal for mantra, chanting and sound sessions; our harmoniums suit devotional singing and kirtan. We also make sitars and publish free guides on choosing and caring for an instrument: https://ragaloom.com/guides/ . Shruti boxes: https://ragaloom.com/buy-shruti-box-online/