Polar heart rate monitor components including straps and case on a white background

Polar

Polar H9 Heart Rate Sensor

£499.00

Track every beat, not every guess. The Polar H9 delivers fast, ECG-accuracy via Bluetooth, ANT+ & 5 kHz, with up to 400 hours battery life—even for swims (30 m) or high-intensity workouts.

Model: 10-Kit M-XXL: 65-107 cm

XS-S: 52-73 cm M-XXL: 65-107 cm 10-Kit XS-S: 52-73 cm 10-Kit M-XXL: 65-107 cm

Product variants

In Stock | Next day delivery available

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Elevate your training precision with the Polar H9, a dependable and budget-friendly ECG chest strap designed to deliver accurate heart rate tracking even during high-intensity workouts. Built with Polar’s advanced electrical heart rate (ECG) technology, the H9 provides real-time, fast-response readings that are not affected by temperature, skin tone, or water—including swims—making it a versatile choice for all athletes. Powered by a replaceable coin cell battery, it delivers an impressive up to 400 hours of usage—that’s over one year of daily one-hour training sessions.

Connectivity is seamless: the H9 provides simultaneous Bluetooth, ANT+, and 5 kHz transmissions for smartphone apps, Polar watches, gym equipment, and third-party platforms. The ergonomic textile strap is soft and snug, easily machine-washable, and gentle on the skin. After your workout, just detach the sensor pod and toss the strap in the wash for easy maintenance. Fully waterproof to 30 m, the H9 stands up to intense sweat sessions, pool laps, and outdoor excursions without skipping a beat.

Whether you're syncing with your favorite fitness app or using Polar Flow to analyze your training, the H9 delivers trusted performance day after day. It’s ideal for athletes looking for simplicity, accuracy, and versatility without the higher price tag—Polar's acclaimed precision and rugged engineering, all for less.

Key Benefits

Measurement Type: ECG-based heart rate sensor—accurate and fast-response
Battery Life: Up to 400 hours (replaceable CR2025 battery)
Connectivity: Dual simultaneous output via Bluetooth® LE, ANT+, and 5 kHz wireless transmission
Water Resistance: WR30—suitable for swimming up to 30 m depth
Strap Comfort: Soft, machine-washable textile strap; available in two sizes (XS–S & M–XXL)
Compatibility: Works seamlessly with Polar Flow, most smartphones, sports watches, gym equipment, and third-party apps
Lightweight Design: Sensor weighs just 21 g; strap approx. 39 g
User-Friendly: Just pair and go—no charging required, long battery life
Durable Build: Robust, everyday-ready design for training longevity

Product Specifications

Sensor Type: ECG chest strap for highly accurate heart rate tracking
Connectivity: Simultaneous Bluetooth LE, ANT+, and 5 kHz GymLink transmission
Battery Life: Up to 400 hours of training per CR2025 coin cell battery
Water Resistance: Rated WR30—suitable for swimming to 30 m
Strap Comfort: Soft, machine-washable textile strap available in XS–S (52–73 cm) and M–XXL (65–107 cm) sizes
Dimensions: Connector: 65 mm × 34 mm × 10 mm
Weight: Connector: 21 g
Strap: 39 g
Materials:
Connector body: ABS, glass-fibre reinforced plastic, polycarbonate, stainless steel
Strap: 38% Polyamide, 29% Polyurethane, 20% Elastane, 13% Polyester
Operating Temperature: –10 °C to +50 °C (14 °F to 122 °F)
Transmission Range: Typically 10–35 m (32–115 ft); up to 100 m in exceptional open-field conditions
Included in Box:
Polar H9 sensor
Soft textile strap
CR2025 coin cell battery installed
Access to Polar Flow and Polar Beat app platforms

Why We Choose Polar

We choose Polar because they’re pioneers in heart rate monitoring and sports technology, trusted by athletes and coaches worldwide for their accuracy, reliability, and innovation.

✅ Proven Accuracy – Polar sensors deliver ECG-precise data trusted by elite athletes.
💡 Innovation Leaders – Over 40 years of expertise in sports science and wearable tech.
🌍 Everyday Usability – Durable, comfortable, and easy to use across all sports.
🏅 Global Trust – Endorsed by professionals, used in training and competition worldwide.

That’s why Polar is part of the Norths Athlete collection — technology you can trust to perform at every level, from everyday workouts to world-class competition.