foone on Twitter: "IT also had an IR port, which could link up with special peripherals wirelessly. Like the Polar Sport Tester PE-3000, which monitored heart rate. So you could remotely record
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Polar Sport Tester for Cattle Heart Rate Measurements | IntechOpen
UNIQ Polar Sport Tester PE 300 Vintage Health Tracker Polar Electro Watch | eBay
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Fitness-Technologie : Wenn die Uhr anzeigt, dass etwas nicht stimmt - WELT
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Polar Sport Tester PE4000 Pulsuhr + Interface
Revealed: The origins of your fitness tracker's tech