Polar H10 Heart Rate Monitor for Men and Women – ANT +, Bluetooth, ECG/EKG - Waterproof HR Sensor with Chest Strap : Amazon.co.uk: Sports & Outdoors
Polar H10 Heart Rate Monitor — PlayBetter
Polar Vantage V Titan - Sports Watch with HRM H10 Chest Strap for Multisport and Triathlon Training with GPS, Heart Rate Monitor, Waterproof: Amazon.co.uk: Sports & Outdoors