COOSPO Heart Rate Monitor Chest Strap H9Z, HRM Bluetooth 5.0 ANT+,Heart Rate Monitor Chest Sensor with Rechargeable Battery

As a regular guy (not a pro rider) and a senior citizen working on a solid exercise plan that includes bike riding, I’ve tested a few heart rate monitors (this one over two weeks), and the COOSPO H9Z stands out as one of the best values on the market. Whether I’m out on long cycling routes or doing interval workouts at home, this chest strap delivers remarkably precise heart rate data that my wrist-based monitors often struggled to get right. The Bluetooth 5.0 and ANT+ connectivity make it incredibly versatile — I’ve paired it seamlessly with my cycling apps, and I like the COOSPO app to easily see the details and history. It connects fast and stays locked in with zero dropouts, which is a big deal mid-ride. Comfort is also top-notch. The adjustable strap is soft and breathable, and I barely notice it’s there, even on longer sessions. Bonus: it’s rechargeable, and the battery life has been excellent, three days over 4 hours each day without a need to recharge. The charger and snap-on unit feature is also superior with no hassle to go from charger to wearing in seconds. That also means no more scrambling for batteries or carrying around a charger. Setup was fast and intuitive, and I appreciate that it’s compatible with so many platforms, it just works. If you're serious about dialing in your training zones and want accurate health data, the H9Z delivers — especially for the price and next-day delivery

While I had high hopes for this device, it has so far been a let-down. On the device itself, the band itself is stretchy, but the material is a bit rough on the skin, so it isn't very comfortable to wear for longer than an hour or two. Second, the pads on the chest straps had to be kept wet/moist at all times for the measurements to work. If you are exercising outside while it's very cold outside, and you don't sweat a lot while exercising, the device may turn itself off because it no longer detects a signal. Since the device turns on and off by itself, there is no way to restart the device unless you lift your shirt, spit on your hands, and then try to wet the pads to get the device to restart. This wouldn't be very feasible when you are outside in the freezing cold. Sometimes the device will shut itself off if you bumped it or wanted to slightly adjust its position because the original "wetting" of the pads are now dry. One frustrating thing about this device is that it has two separate apps, HearTool and CoospoRide. Despite being owned by the same company, they force you to register for different accounts for the separate apps (no way to use the apps unless you register for an account.) The HearTool app, while it allows you to measure your heart rate and HRV values, is quite finicky. It forces you to wait 2 minutes in the app to get those values measured, and will get stuck if you switch apps and come back to the app later. For example, if you switched to reading your email and return to the app, the app will get stuck on a Loading... screen. You will have no choice but to force stop the app, redo the measurement, and wait the full 2 mins in the same app when it is counting down for the results to show up properly. Despite this fact, however, the values are somewhat suspect, since with an HR of 120 and a rMSSD of 9, the app will still say Low stress. I am not quite sure how the app specifically determines this, but the reading just seems inaccurate. On the CoospoRide app, which allows you to track bike rides (the primary reason I got this device), could also use a lot of improvements. First, while tracking your rides, the app does not show up in your notifications area where you can pause or stop the tracking, or even see your current stats. Unless you keep the app in the foreground, you will have to find the app in your app drawer somewhere to bring the tracking back up so you can manage your stats. This is quite frustrating especially when you multitask on your phone a lot. Second, while it keeps track of your speed and heart rate during your rides, the speed readings are often quite off even when they are taken from your phone's GPS. For example, when intentionally trying to bike very slowly (~10 mph), the app will tell me my max speed is ~25mph. When my speed reaches around 23-24mph, the app tells me I am riding at 75mph (which is physically impossible). I also find that the app will often stop tracking my heart rate (not sure if this was due to the device disconnecting or something else), and the stats won't appear in the app at all once the ride has been completed. The app also does not feature a replay feature that allows you to replay your ride progress, such as the speed/time/location you were at during the time of your ride. All you see is an overview map of your speed stats and other numeric/graph stats. It is also not possible to switch between an elapsed time view and a view that shows you the true time during the exercise. While the app allows you to "export" your stats, it only supports exporting that data as a picture screenshot of the app, versus the raw stats of your exercise. There are also no zoom features that allow you to see a particular time frame more closely, and longer bike rides will similarly get compacted into the same view as a 5-min bike ride.

Turned off on me in race but worked excellent on long run. I think it was my error. Great price very nice

Been using two weeks. Evaluated accuracy and felt it measured accurately. So simple to use. Basically straps on and starts working. Strap is very comfortable. Love the rechargeable battery. Lasts a long time. App for phone is very basic but that is all I need. Do wish O could label the workouts on the app. Product is a great value.

It MOSTLY does the job. I’ve had issues on just about every run. It randomly stops working or glitches for a few seconds and takes a while to catch back up to my actual heart rate. This causes it to skew the data at the end of the run. A bit of an inconvenience. Not sure if it’s a common occurrence or just mine.