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BackOr 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, CR1220 battery holder, Memory Protection Devices P/N BC2AAPC, http://www.memoryprotectiondevices.com/datasheets/BC2AAPC-datasheet.pdf 2xAA cell battery CR-1025 coin cell retainer CR2032 BR2032 BatteryHolder Battery AA battery holder Keystone type 3009 coin cell holder 2xAA cell battery holder, Memory Protection Devices P/N BC12AAPC, http://www.memoryprotectiondevices.com/datasheets/BC12AAPC-datasheet.pdf BC2003 CR2032 2032 Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch for High-Density Packaging Surface Mount Single Row 2.54mm.