Product Price Heart Rate Accuracy (%) Battery Life (hours) Water Resistance (meter) Screen Size (inches) GPS Accuracy (meters) Compatibility
Amazfit GTR 4
US
£119.19 Generally accurate but exhibits a several-second lag on rapid changes; readings match chest-strap values once settled 14 days (typical use) 5 ATM (50 meters) 1.43 in Improved dual-band circularly polarized antenna for precise positioning; generally strong GPS lock Android 7.0 and above; iOS 12.0 and above

The Amazfit GTR 4 is a 46mm fitness-focused smartwatch with a 1.43 in AMOLED display, BioTracker 4.0 PPG heart-rate sensor, dual-band GPS, Alexa support, and up to 14 days battery life. It targets users who want long runtimes and robust fitness tracking at a mid-range price.

★ Ideal for

Suitable because it offers accurate wrist heart-rate monitoring (BioTracker 4.0) and up to 14 days battery life while remaining under £200.

Apple Watch SE 3 40mm
US
£178.78 18 hours 50 meters 1.57 in iPhone running latest iOS

The Apple Watch SE 3 40mm is an entry-level Apple Watch with an Always-On Retina display, S10 chip, core fitness tracking including optical heart rate monitoring, safety features like crash detection, and swim-ready 50m water resistance. It suits users who want Apple Watch performance and safety features without advanced medical sensors like ECG or SpO2.

★ Ideal for

Suitable because it offers optical heart rate monitoring and 18 hours battery life at a price point that can fall under £200 during deals, making it a top-rated option for budget buyers seeking reliable heart-rate tracking.

Polar Pacer
US
£148.98 Precision Prime GEN 3.5 optical HR; measuring range 15-240 bpm Up to 35 h training mode; up to 7 days watch mode; up to 100 h with power save WR50 1.2 in Distance ±2%; average route accuracy 5m Bluetooth 5.1; compatible with Polar Flow app (Windows, Mac, iOS, Android)

The Polar Pacer is a lightweight GPS running watch with Polar Precision Prime optical heart-rate sensing, a 1.2 in always-on MIP color display, multi-GNSS support and long battery life aimed at runners and multisport athletes. It provides core training metrics, sleep and recovery insights and simple smartphone connectivity without touchscreen complexity.

★ Ideal for

Ideal for buyers seeking top-rated heart-rate-monitor smartwatches under £200 because it offers Precision Prime optical HR (15-240 bpm), multi-GNSS with ±2% distance accuracy, and up to 35 h GPS battery life.