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And easier to tell in real life than in the digital realm, or perhaps an external CV-to-pulse-rate module? Is this even useful? - Seven-segment display. Can be done with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, Keystone P/N 2468, http://www.keyelco.com/product-pdf.cfm?p=1033 AAA battery holder Keystone 2xAAA cell battery CR-1025 coin cell vertical battery CR-2025 coin cell retainer BR2016.

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