Polar T31 Coded Chest Transmitter and Elastic Strap – Black

Product Images
Product Features
- 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
- 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
Product Specifications
Brand | POLAR |
Material | Elasticized-Fabric |
Color | Black |
Compatible Devices | Polar FT2 |
Team Name | Polar |
Screen Size | 54 Inches |
Item Weight | 0.01 Kilograms |
Battery Life | 2500 Hours |
Sensor Type | Wearable |
Battery Description | Lithium-Ion, Non-replaceable |
UPC | 725882017594 |
Global Trade Identification Number | 00725882201351, 00725882017594 |
Manufacturer | Polar |
Item Package Dimensions L x W x H | 12.19 x 3.78 x 1.14 inches |
Package Weight | 0.15 Kilograms |
Item Dimensions LxWxH | 0.04 x 0.04 x 0.04 inches |
Brand Name | POLAR |
Country of Origin | United States |
Model Name | Polar T31 |
Part Number | 92053125 |
Model Year | 2006 |
Included Components | Heart Rate Transmitter |
Sport Type | Excercise & Fitness |
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Product Price History
Price history for Polar T31 Coded Chest Transmitter and Elastic Strap - Black | |
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Excellent Telemetry Strap. 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+ AccurateCons:- 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.
Excellent Telemetry Strap. 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+ AccurateCons:- 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.
Great for a week, now it’s garbage. 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.
Works, accurate, durable. I originally purchased a Polar RS100 which came with the Polar soft strap and sensor.I ended up tossing the soft strap and sensor as it was constantly dropping out and eventually it would never pick up my heart rate again.This older 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 to pick up my heart rate.I think the problem with the newer Polar soft strap was that the internal wiring was damaged over time by cinching the strap too tightly. With the T31 strap this problem isn’t possible as all the electronic components are separate from the elastic strap.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 sensor.This strap would be perfect if it had a replaceable battery. There are You Tube videos out there demonstrating how to replace the battery in the T31 strap however it takes a little bravery and being competent with hand tools. Then again if your battery is dead then you really have nothing to lose. You either ruin your already dead T31 strap or you buy a new one.The loss of comfort from the soft strap to the T31 strap is minimal. Honestly I can’t even really tell. If you have a good work out going I doubt any person could really notice.I recommend this strap over the soft strap unless Bluetooth is required. If you need Bluetooth this strap isn’t for you.
Works, accurate, durable. I originally purchased a Polar RS100 which came with the Polar soft strap and sensor.I ended up tossing the soft strap and sensor as it was constantly dropping out and eventually it would never pick up my heart rate again.This older 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 to pick up my heart rate.I think the problem with the newer Polar soft strap was that the internal wiring was damaged over time by cinching the strap too tightly. With the T31 strap this problem isn’t possible as all the electronic components are separate from the elastic strap.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 sensor.This strap would be perfect if it had a replaceable battery. There are You Tube videos out there demonstrating how to replace the battery in the T31 strap however it takes a little bravery and being competent with hand tools. Then again if your battery is dead then you really have nothing to lose. You either ruin your already dead T31 strap or you buy a new one.The loss of comfort from the soft strap to the T31 strap is minimal. Honestly I can’t even really tell. If you have a good work out going I doubt any person could really notice.I recommend this strap over the soft strap unless Bluetooth is required. If you need Bluetooth this strap isn’t for you.
2 year battery life BUT read the whole review. 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!
2 year battery life BUT read the whole review. 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!
2 year battery life BUT read the whole review. 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!
Didn’t work with my heart rate monitor. Didn’t work with my heart rate monitor.
so far so good. I have an ft4, had for 8 years, original chest strap. Change the battery and away you go. Couple of weeks ago, wouldn’t pair, changed all batteries, nada. new set up $250 at least. not interested in ‘charge your watch every 7 days’. found this on Amazon, $49. took a chance. Seems to be working well. So fingers crossed, and if it continues to work, happy days.
so far so good. I have an ft4, had for 8 years, original chest strap. Change the battery and away you go. Couple of weeks ago, wouldn’t pair, changed all batteries, nada. new set up $250 at least. not interested in ‘charge your watch every 7 days’. found this on Amazon, $49. took a chance. Seems to be working well. So fingers crossed, and if it continues to work, happy days.
It did not work when riding my bike. I had this transmitter before and really liked it. So I bought it again. It worked great on all the gym equipment. When I got on my mountain bike, it would “0” out when riding. If I brought my hand back about 5 inches, the watch would pick up the transmitter. So riding uphill with both hands on my handlebars it would not work. I contacted Polar about that and after no response from them, I just bought another unit. They had been good before on responding, not sure what is going on now.
Received as described. Product received as discribed and in excellent condition
Poor battery life. Purchased the Polar T31 on November 17, 2023, on December 29, 2023 it stopped working after four uses. I was curious if there was a malfunction with the unit or was it the battery. I dismantled the unit knowing I wasn’t going to send it back and checked the battery. The 2023 battery is rated at 3 volts, the battery in my T31 is only putting out .85 volts. Not enough to transmit a signal to my treadmill.I come to the conclusion the Polar T31 I was sold had to be “new old stock”.I do not recommend this product!!
Poor battery life. Purchased the Polar T31 on November 17, 2023, on December 29, 2023 it stopped working after four uses. I was curious if there was a malfunction with the unit or was it the battery. I dismantled the unit knowing I wasn’t going to send it back and checked the battery. The 2023 battery is rated at 3 volts, the battery in my T31 is only putting out .85 volts. Not enough to transmit a signal to my treadmill.I come to the conclusion the Polar T31 I was sold had to be “new old stock”.I do not recommend this product!!
Connects to my Life Fitness elliptical trainer. Does what its supposed to at a great price. Now my elliptical trainer can adjust the workout according to my heart rate.
Replacement chest transmitter. 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.
Works great with Lifecycle Fitness recumbent exercise bike. From what I could find, the product specifications did not indicate that this would work with my 99′ Lifecycle Fitness recumbent exercise bike (LC-5500R).
Works well with Precor treadmill. This heart rate monitor works extremely well with a Precor 9.33 treadmill.
Worked as needed. Great replacement for old one. Worked accurately