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Tarek Loubani, a doctor working in the Gaza strip developed a DIY 3d printable stethoscope that can be made for 4-5 USD or even less, but it works as good as 200 USD professional grade model.Here is his talk at CCCamp15 worth watching if you are interested in this area and you want to see the development process and the need for such devices in hard conditions:
All the files for the stethoscope with construction instructions can be found at:
https://github.com/GliaX/Stethoscope
Source:
http://www.theregister.co.uk/2015/08/14/printed_stethoscope_cccamp/
http://motherboard.vice.com/read/this-3d-printed-stethoscope-head-costs-5-outperforms-200-competitors (with sound measurement charts)
