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Polar T31 Coded Chest Transmitter and Elastic Strap - Black

4.2 4.2 out of 5 stars 2,556 ratings
$43.29 with 6 percent savings
List Price: $45.95

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Purchase options and add-ons

Brand POLAR
Material Elasticized-Fabric
Color Black
Screen Size 54 Inches
Item Weight 0.01 Kilograms
Battery Life 2500 Hours
Sensor Type Wearable

About this item

  • Transmits heart rate data to Polar heart rate monitors using 5kHz transmission and compatible gym equipment. Compatible heart rate monitors include, but are not limited to: FT1, FT2, FT4, FT7, FT40, FT60, FT80, RS100, RS300X, RS400, RCX5
  • Compatible products:Elastic straps.Individually coded to pick up your heart rate monitor and not others nearby. This eliminates cross-talk with other electronic devices in the same area.
  • Slim, lightweight, and waterproof design
  • Fits 25 to 54 inch chest size
  • Average battery lifetime is 2500 hours of use. Non user replaceable battery
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From the manufacturer

heart rate sensor monitor transmitter

Polar T31 Transmitter

At the heart of your training is the Polar T31 Coded Transmitter. Its purpose is simple: to transmit your heart rate to your wrist unit. Slim and light, the ECG (electrocardiogram) accurate transmitter is fully water resistant and designed for all weather conditions.

Compatible heart rate monitors include, but are not limited to: FT1, FT2, FT4, FT7, FT40, FT60, FT80, RS100, RS300X, RS400, RCX5.

Product Description

Product Description

At the heart of your training is the Polar T31 Coded Transmitter. Its purpose is simple: to transmit your heart rate to your wrist unit. Slim and light, the ECG (electrocardiogram) accurate transmitter is fully water resistant and designed for all weather conditions. Compatible heart rate monitors include, but are not limited to: FT1, FT2, FT4, FT7, FT40, FT60, FT80, RS100, RS300X, RS400, RCX5.

Amazon.com

Slim, lightweight, and water-resistant, the Polar T31 coded transmitter and belt set accurately transmits your heart rate data to your Polar wrist-top computer. As a result, it's easy to monitor your heart rate during training runs. This version of the T31 coded, meaning it prevents crosstalk from other electronic devices to ensure complete accuracy (Polar also sells a non-coded T31). It's also built to last, with a design that holds up to 2,500 hours of training usage. The transmitter belt--which works with all current Polar wrist-top computers except the CS600 and RS800--includes a sealed transmitter and elastic strap.

About Polar
The first EKG accurate wireless heart rate monitor was invented by Polar back in 1977 as a training tool for the Finnish National Cross Country Ski Team. The concept of "intensity training" by heart rate swept the athletic world in the eighties. By the 1990s, individuals were looking to heart rate monitors not only for performance training needs, but also for achieving everyday fitness goals. Today, the same concept of heart rate training is being used by world-class athletes as well as everyday people trying to lose weight. Polar is the leading brand among consumers, coaches, and personal trainers worldwide and the company is committed to not only producing the best products, but also being the leading educator on the benefits of heart rate based exercise.

Getting Started
Getting started with your T31 Coded Transmitter is easy. For best results, thoroughly moisten the back electrode areas of the transmitter with water and adjust the strap length to fit snug, but comfortable. Check that the moist electrode areas are firmly against your skin and that the Polar logo is in the upright position. Tip: When you are finished with your workout, remove the transmitter, rinse with water and dry with a soft towel. Never store the transmitter wet, in a damp environment or in any kind of non-breathable material, such as a plastic bag or sports bag. Sweat and moisture may keep the electrodes wet and the heart rate sensor activated. This will shorten the battery life. Keep in a cool and dry place.

Tip:

When you are finished with your workout, remove the transmitter, rinse with water and dry with a soft towel. Never store the transmitter wet, in a damp environment or in any kind of non-breathable material, such as a plastic bag or sports bag. Sweat and moisture may keep the electrodes wet and the heart rate sensor activated. This will shorten the battery life. Keep in a cool and dry place.

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Polar T31 Coded Chest Transmitter and Elastic Strap - Black

Polar T31 Coded Chest Transmitter and Elastic Strap - Black

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Product guides and documents

Installation Manual (PDF)
User Manual (PDF)

Important information

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Customer reviews

4.2 out of 5 stars
4.2 out of 5
2,556 global ratings

Customers say

Customers like the heart rate monitor's performance, saying it works great and keeps an accurate heart rate. They also appreciate the ease of use and comfort. However, some customers have reported issues with the battery life, saying the battery cannot be replaced. Opinions are mixed on quality, accuracy, and connectivity.

AI-generated from the text of customer reviews

243 customers mention187 positive56 negative

Customers like the performance of the HR transmitter. They say it works great, comfortable to wear, and picks up the signal quickly. Some customers also mention that the product works great on all the gym equipment. However, some customers report issues with the battery life and intermittent extreme signals.

"...It works flawlessly, as did the last one. Do read the instructions that state the sensor must be dampened to work correctly...." Read more

"...All the way through the workout it works perfectly...." Read more

"...It's really a great tool to use. I now focus on getting my heartrate into that range as quick as I can and keep it there throughout my workout...." Read more

"...works with the polar wrist-watches, but I have found that the 'coding' doesn't work with the Life Fitness treadmills/elliptical machines or the..." Read more

39 customers mention28 positive11 negative

Customers like the heart rate monitor. They say it helps them track their heart rate and progress, and it's great for accurate heart rate measurement during exercise. Some customers also mention that it'll transmit their bpm to their Polar device. Overall, customers are satisfied with the product's accuracy and ease of use.

"...more durable strap seems to work better for me as I have never had my heart rate drop out and it only takes a minute or two for the built in sensor..." Read more

"...My fitbit then calculates my steps and keeps track of my workout...." Read more

"I bought this "NEW" in June of 2016. In July 2018 it started not broadcasting my heart rate for about the first 20 minutes every workout until it..." Read more

"...It keeps an accurate heart rate along with the computer built into the Assault Air Bike." Read more

30 customers mention25 positive5 negative

Customers like the comfort of the biometric monitor. They mention that it's very comfortable and easy to use. Some say that the sensor is comfortable and the transmitter isn't as uncomfortable as they thought it would be.

"...This may not seem like a big win, but it's much more comfortable to walk on a treadmill or use an elliptical machine without having to hold on to..." Read more

"...Also wearing the transmitter wasn't as uncomfortable as I thought it would be...." Read more

"...The strap is comfortable, easy to adjust and put on, and there is no programming on syncing required...." Read more

"...I find it comfortable for cycling, and hardly notice it's there...." Read more

26 customers mention24 positive2 negative

Customers find the product easy to use. They say it's very easy to set up at the gym or home, and the basic HRM design works well. They also say the strap is easy to wrap around their chest and connect the loose ends. Customers also say it pairs up right away and is convenient.

"Very easy to use" Read more

"...Using the strap is easy: you just wrap it around your chest, connect the loose end of the strap to the sensor and moisten the contacts...." Read more

"...The strap is comfortable, easy to adjust and put on, and there is no programming on syncing required...." Read more

"...bike, and this product connected to it instantly and responds quickly to pulse changes...." Read more

70 customers mention41 positive29 negative

Customers are mixed about the quality of the product. Some mention it's very durable, reliable, and has excellent build quality. Others say that the plastic broke after 14 years where the strap snaps in, and that the tabs result in brittleness with time and use.

"...Pros:+ Fully waterproof+ Excellent build quality+ Comfortable+ AccurateCons:-..." Read more

"...I'm compelled to believe that it's a faulty product." Read more

"...I believe this strap is far more durable than the newer straps and I'm glad I went this route instead of just buying a new updated soft strap and..." Read more

"...My prior T31 still works but the plastic broke after 14 years where the strap snaps in...." Read more

35 customers mention24 positive11 negative

Customers are mixed about the connectivity of the product. Some mention that it syncs to the machines and equipment at the gym, and functions flawlessly. However, others say that it was unable to connect with any devices or systems.

"...is comfortable, easy to adjust and put on, and there is no programming on syncing required...." Read more

"...It does sync with older precor elliptical, but true that if you have dimmer-switch lights, you should turn them all the way up or down, otherwise it..." Read more

"...in mind thos is not the 80$ model that has bluetooth so it will not pair with your phone. Over all if I was not so hairy or bulky it would be great...." Read more

"I use a BH S3RiB recumbent exercise bike, and this product connected to it instantly and responds quickly to pulse changes...." Read more

27 customers mention11 positive16 negative

Customers are mixed about the accuracy of the biometric monitor. Some mention that the transmitter works well and is consistent, while others say that the readings were very erratic and inaccurate. They also say that they don't always get reliable readings when using the Wearlink and associated strap.

"...wearing a telemetry strap, the machine will get confused and vary wildly in its reading...." Read more

"...All of that drama aside, the HR transmitter works well and seems accurate. I prefer the soft Polar straps over this style...." Read more

"...Sometimes the reading just flat out shuts off and the machine tells me it needs my heart rate...." Read more

"...I use it every time at the gym and it's very accurate...." Read more

59 customers mention7 positive52 negative

Customers are dissatisfied with the battery life of the product. They mention that it wears out quickly and cannot be replaced. Some say that the battery must be changed by the factory.

"...Within the last 5 or 10 years or so the battery life has gotten shorter and shorter...." Read more

"...I've heard the big negative to this device is that the battery must be changed by the factory and it's less expensive to replace the entire product...." Read more

"...I never had any of these issues with the T31. Yes, the battery wears out, and I end up buying a new one yearly, but it beats the continuously..." Read more

"...I only wish that the battery was easily changeable -- it seems wasteful to replace the entire band." Read more

Envío Rápido / Calidad del producto confirmada
5 Stars
Envío Rápido / Calidad del producto confirmada
Compre el producto desde Bogotá, Colombia. Realice el pago el día 2 de enero, y el 7 ya lo tenía en mis manos. Llegó en su empaque, sellado y en perfecto estado. Lo compre porque hace 13 años tengo un polar F6 que funciona perfectamente, adecuado aún para lo que necesito. Al transmisor que compre con el reloj, se le cristalizo el polímero y se rompió por los sensores, decidí reemplazarlo porque es más exacto tomar la FC desde el sensor en el pecho, que en la muñeca. Además con el T31 puedo conectarme a otros dispositivos. Al haber usado el anterior durante muchos años pero no de manera continua, me abstengo de evaluar la eficiencia de la batería, porque no puedo definir su duración neta, además la batería del sensor de ahora posiblemente es totalmente diferente, por lo tanto la comparación no aplica.
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Top reviews from the United States

Ray-In-GA
5.0 out of 5 stars Replacement chest transmitter
Reviewed in the United States on February 26, 2024
Verified Purchase
My old transmitter broke at the attach point. I glued that side together and used the other side for a couple years but it eventually broke too. I could have glued it and put it on over my head but decided to try this replacement instead. It works flawlessly, as did the last one. Do read the instructions that state the sensor must be dampened to work correctly. Many others must have tossed the instructions and complain that they have to wet it to get it to work.
One person found this helpful
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Alaskan forever
5.0 out of 5 stars 2 year battery life BUT read the whole review
Reviewed in the United States on December 27, 2018
Verified Purchase
I bought this "NEW" in June of 2016. In July 2018 it started not broadcasting my heart rate for about the first 20 minutes every workout until it gets warm and a little sweaty, then it starts working, slowly coming down from 220 indicated BPM or so to what my actual heart rate is. (my heart doesn't go 220-bpm) There are 25 spinning bikes in the room, it does the same thing ON ALL 25 BIKES, EVERY SINGLE BIKE SAME THING, so it is not the heart rate indicator on "THE BIKE"! I have used Polar HRMs since the 1990s maybe 1980s? Within the last 5 or 10 years or so the battery life has gotten shorter and shorter. Maybe mine sat on the shelf in some department store or in some bike shop for the first 5 or 10 years of its life before I bought it "NEW" from Amazon? I honestly don't know what to do. I have to buy another one because all the equipment i use at the health club (where i work) is Polar compatible. Maybe the non-coded one is cheaper and will last longer, we will see.
This is a follow up, March 2019. I tried an experiment for the last month or two. I run the transmitter under water in the sink at the health club for a second or 2, just to make it wet. I put it on wet and i go into the spinning room and it works perfectly the second i turn on the heart rate indicator on the bike. All the way through the workout it works perfectly. SO if you have one that stopped working or works intermittently, run it under water and put it on to see if that makes it work. Maybe it is an indicator that the battery is getting low but this saved me from buying a new one at this time. Good luck!
19 people found this helpful
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Marc F. Cymes
5.0 out of 5 stars Works
Reviewed in the United States on April 5, 2024
Verified Purchase
Very easy to use
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TonyK
4.0 out of 5 stars Excellent Telemetry Strap
Reviewed in the United States on February 10, 2010
Verified Purchase
I purchased this telemetry strap to use while working out at the gym. Almost all the cardio machines at my gym have Polar receivers and can display my heart rate from this transmitter without having to hold on to the physical sensors. This may not seem like a big win, but it's much more comfortable to walk on a treadmill or use an elliptical machine without having to hold on to heart rate sensors.

Using the strap is easy: you just wrap it around your chest, connect the loose end of the strap to the sensor and moisten the contacts. There is no on/off button so you don't have to worry about anything except for putting it on. It is fairly comfortable to wear, and I don't really notice when it is on. The whole thing is made out of plastic and the strap is elastic. The build quality is excellent and it is completely waterproof.

The strap is 'coded' which means that you don't have to worry about interference from other people wearing straps around the gym. This works with the polar wrist-watches, but I have found that the 'coding' doesn't work with the Life Fitness treadmills/elliptical machines or the Precor elliptical machines at my gym. Your mileage may vary, but if the person next to me on the machine is also wearing a telemetry strap, the machine will get confused and vary wildly in its reading. Sometimes it will display my heart rate, and others it will display the person next to me. This is more a problem of the proximity of the machines. If the other person is one machine away, there is no problem with interference. I haven't found this to be a big deal, if I need to I just move one machine over.

Pros:
+ Fully waterproof
+ Excellent build quality
+ Comfortable
+ Accurate

Cons:
- Interference with other transmitters nearby in gym (this is a problem with the receiver on the equipment, not the strap).

Bottom Line: Excellent strap to use with a watch. If you are using in a gym with a receiver on a machine, be prepared to deal with some interference if there is another transmitter within 5-10 feet.
38 people found this helpful
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cygx
1.0 out of 5 stars Great for a week, now it's garbage
Reviewed in the United States on March 11, 2013
Verified Purchase
I've been using this strap at the gym with a LifeFitness elliptical and treadmill. When I first used it, it was excellent. I just hopped on the elliptical and started the workout and the strap automatically kicked in and sent information to the machine. I didn't even have to sweat a whole lot. Same thing with the treadmill. Throughout my roughly 1 hour workouts for about 1 week, it worked perfectly.

A few days ago though I started noticing problems with the heart rate reading on the machine. From the usual 158-165 BPM I try to stick to, it all of a sudden goes to like..130 or 140 or even 120 out of nowhere. Since the machines I'm using are basing the strain of the exercise on my inputted target heart rate (160), when there's a sudden drop like that, the whole workout gets all screwed up (the resistance on the elliptical skyrockets, or the incline on the treadmill). Sometimes the reading just flat out shuts off and the machine tells me it needs my heart rate.

I'm pretty sure I've ruled out the possibility of interference, as for that first week when the strap was working just fine, there were sometimes people right next to me with a polar wrist strap on. No interference. On top of that, it's happening when I'm at least 5 machines away from anyone else.

Also, I don't think the problem is with the battery either. Before I made my purchase, I read that the sensors are very sensitive to wetness. Everytime I'm done with the strap, I take it off and dry it well, then place it in a dry area until the next day.

Lastly, if it were a problem with the machine itself then why is it happening on multiple machines, of two different kinds?

I'm compelled to believe that it's a faulty product.
10 people found this helpful
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Top reviews from other countries

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Guillermo
5.0 out of 5 stars Excelente producto
Reviewed in Mexico on March 9, 2024
Verified Purchase
Funciona perfectamente con mi monitor
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Lucy
5.0 out of 5 stars Prodotto come da descrizione
Reviewed in Italy on April 9, 2024
Verified Purchase
Il trasmettitore Polar è compatibile con l'orologio Polar, funziona benissimo, unico inconveniente di questi trasmettitori è che la batteria non è sostituibile, quindi come mi è gia' successo quando la batteria si esaurisce devi buttare il trasmettitore.
One person found this helpful
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franz urban
5.0 out of 5 stars Gute Ergänzung
Reviewed in Germany on March 28, 2024
Verified Purchase
Passt gut zum Polar Sender / Rad
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Daniel
4.0 out of 5 stars Réponse
Reviewed in Belgium on January 20, 2024
Verified Purchase
C'est un bon produit pour ceux qui veulent savoir le niveau de la fréquence cardiaque pendante les exercices....malhereusement la ceinture n'est pas compatible avec les appareils Precor de ma salle de fitness Jims a Jette
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Iosusting
5.0 out of 5 stars Cumple con lo que ofrece
Reviewed in Spain on November 22, 2023
Verified Purchase
Tercer transmisor que compro, como los anteriores, funciona correctamente y se conecta con el reloj sin problemas. Calidad muy buena como es norma en la marca Polar.
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