Scosche Rhythm R+2.0: Advanced Waterproof & Dustproof Heart Rate Monitor Armband with ANT+ & BLE Bluetooth Smart for Accurate Workout Tracking Compatible with Smartphones, Wahoo, Peloton, NordicTrack

Accurate, comfortable, long lasting and easy to use heart rate monitor that doesn’t cost a fortune.
This is the best heart monitor I’ve had that wasn’t a chest strap. I paired it with my iPhone 6 Plus, and was glad to see that it worked with the Apple Health app. I’ve mainly used it with IRunner on ios, and it displayed my heart rate changes as I started running and slowed down to walk, indicating that it was indeed closely tracking my heartrate.To get a good reading I’ve had to find the Rhythm Plus’ sweet spot: with the sensor near my elbow, over a vein for the optical sensor. I also made sure the band was snug and tight, but not too constricting. Fortunately the band is very soft, comfortable to wear and easy to adjust.The battery life has been fine so far, my workouts have been around 1 to 2 hours, and the workout app has been registering solid readings throughout, no flakiness in the data. But I think all of that depends on how you position and tighten the monitor on your arm.Different apps (like myfitnesspal) use the heart rate data to calculate your calories expended automatically, which is really nice. I think this was definitely a great purchase because it’s accurate, works well with many ios apps, and is easy to adjust and comfortable to wear.** Update 10-18-2015 **I verified the Scosche Rhythm Plus with the grip heart rate monitor on the Merit 725 T Plus treadmill. Throughout my 2.8 mile run, the differences between the readings were never off by more than 1 to 2 beats per minute – which is exceptional, considering they use 2 completely different methods to measure heart rate (Scosche uses optical measurement, the Merit treadmill uses skin electrical conduction).I now have complete confidence that the Scosche is accurate, and all the apps that use that data are getting accurate results. Very glad I can trust these results and don’t have to use a chest strap heart rate monitor on my runs!!!I do recommend that you do use a second source (treadmill heart monitor, chest strap, Apple Watch, etc) to verify that you are positioning the Scosche sensor correctly, and that your heart rate numbers are very closely agreeing.** Update 10-25-2015 **I did intervals for the first time, pushing my heart rate to 90% and higher. The Rhythm Plus was able to keep up during all my interval running. And I checked my reading with the treadmill HR monitor every few minutes, and again they agreed within 1 to 2 bpm’s. This was a critical test because I tend to over-train and burnout, and now I can see (via my training app) how hard I need to push, and when I need to rest, rather than going by how hard I “felt” I was working.I also found this out while doing intervals: when your bpm goes to 160 bpm or higher, the light on the sensor changes from blinking violet to blinking red, giving a visual indication that you’re above the “target” heart zone. Very clever.Since I was running and pumping my arms quickly, I had to make sure that the band was a little bit tighter so that it wouldn’t loosen up when my arm was flailing. The band being tight (not too tight mind you) didn’t affect my circulation, and helped the sensor give readings that were consistent with my treadmill’s heart rate monitor.

Muy practico y facil de colocar en el brazo. Lo apago despues del ejercicio, cuando lo enciendo de nuevo, de inmediato conecta el GPS, cosa que no pasaba con mi reloj Huawey que constantemente se desconfiguraba el GPS

The best heart rate sensor in terms of accuracy. I wish this model had cadence as well for riders but that was added later in rhythm24.Overall, this is still my go to monitor for pairing with my Apple Watch