Casio Pro Trek WSD-F21HR has a headline feature most rivals already offer

(Image credit: Casio)

Casio has just announced a new entry in its Pro Trek series, catchily called the Casio Pro Trek WSD-F21HR, and that name might give you a hint at its headline feature. Still struggling? It’s a heart rate monitor.

Surprisingly, other entries in the range such as the Casio Pro Trek WSD-F30 and the Casio Pro Trek Smart WSD-F20 don’t have a heart rate monitor, so this makes for a substantial upgrade – even if it’s an upgrade that many other smartwatches and fitness trackers already offer.

The Casio Pro Trek WSD-F21HR uses an optical heart rate sensor which can express its readings as one of five heart rate zones. The WSD-F21HR also has a Heart Rate watch face, which allows the wearable to automatically switch to the heart rate monitor screen when it detects motion.

While heart rate tracking might have been a long time coming, coupled with the rest of what the Casio Pro Trek WSD-F21HR offers it should make for a full-featured smartwatch.

The wearable additionally sports GPS, offline maps, and detailed activity tracking, including for running and trail running.

Plus, the Casio Pro Trek WSD-F21HR is water-resistant to depths of 50 meters, and it has a dual-layer screen, allowing you to switch to a low-power display when you don’t need all the smart functions.

The watch runs Wear OS, so it has access to a wide range of apps, and it’s set to cost $499 (around £410 / AU$735) when it hits stores in September.

James Rogerson

James is a freelance phones, tablets and wearables writer and sub-editor at TechRadar. He has a love for everything ‘smart’, from watches to lights, and can often be found arguing with AI assistants or drowning in the latest apps. James also contributes to, and and has written for T3, Digital Camera World, Clarity Media and others, with work on the web, in print and on TV.