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How does the plethysmograph work?
Each wave (see image) corresponds to a heartbeat and the wave amplitude corresponds to the amount of blood detected. If the wave amplitude is low, this means that your blood perfusion is too low for a reliable read. You should retake your measurement and make sure that your finger is positioned right under the LED lights.
Helen
Reviewed in the United States on March 4, 2025
Works as described. No issues and a nice tool for assessing health quickly.
N. Amburn
Reviewed in the United States on March 3, 2025
Easy and accurate. I tried a cheaper oximeter that was totally worthless and was returned. This one is a keeper because it is easy to read, works with or without phone app.
Gary
Reviewed in the United States on February 24, 2025
Works perfectly. Easy to use.
ShowDog
Reviewed in the United States on January 6, 2025
It’s a great accurate product. Only reason I didn’t give it 5 stars is because they didn’t include a case. They just provided a cheap lanyard . A product this nice deserves to be in a case. All of the others including the equate wal-mart ones come in a case.
Betsy M.
Reviewed in the United States on January 4, 2025
Since the pandemic and a bout of pneumonia, I have gone through several oximeters. They tend to work fine for a month to three months and then die out. This product is by far the best. It stays tight about the finger and gives clear and complete information. The accompanying app is easy to use, self-explanatory, and thorough, giving information not only on oxygen levels, but on several different readings. I highly recommend this product.
HECJR
Reviewed in the United States on August 10, 2024
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Anonymous Addict
Reviewed in the United States on July 21, 2024
I have regular heart problems so I have several devices I use to keep an eye on my general health when I’m not feeling well. This has quickly become one of my favorites.When comparing to my other devices it’s accurate and I love the app that it connects to so that you can watch the readings real time. The App Store reviews are bad but I think it might be from the age group using these devices are not tech savvy because I found it very cool and easy to use.I also like that it comes with a tether so that I can tether it around my wrist at night so that if it falls off I don’t lose it.Great device and would highly recommend 10/10
Jae
Reviewed in the United States on June 20, 2024
This thing rocks. I work as a paramedic and sometimes our $15,000 monitor decides to act like it's from dollar tree. I use this in conjunction w our monitor and it is a life saver.Why this thing is so awesome:1. Bluetooth - absolute game changer for me. not only can you save recordings for later but the connection is seamless. open the app and it instantly connects with no fuss. since i'm usually sitting behind the patient I can monitor the oxygen saturation and waveform with my phone sitting up and not have to constantly look at their finger2. Plethysmograph - the waveform shown on the screen allows to help verify the accuracy of the readings. A smooth, consistent waveform usually means a good reading. Also pleth waves coincide with mechanical output of the heart so I can see things on it like irregular heart rhythms (for example afib)3. the screen flips - first of all the device off by itself when you put the finger out which i think is awesome bc i never have to worry about leaving it on but once it is on and on a finger pushing the power button actually rotates the screen. so if you're taking readings from the side or front you can turn it whatever way you want4. perfusion index - another way to help verify accuracy. perfusion index generally falls between 0.3 and 10. low number usually means poor blood circulation like cold fingers, low blood pressure, etc.I find the oximetry readings and pleth waves to be very accurate when compared to our $15k monitor. The reading and heart rate shows the same on both. The heart rate even seems to show the same as our cardiac monitor with electrodes.I like that it comes w a lanyard and place to attach. I also bought a case for it off Amazon.--The bad: the respiratory rate is not accurate. I'm assuming it is calculating respiratory rate by using algorithms to calculate respiratory activity based on changes in the pleth. This device tends to way overshoot legitimate respiratory rate. It may say respiratory rate is 34 when it is really 12. I do not trust it what so ever. If you're trying to actually calculate respiratory rate try out an app like MedTimer.Overall I love it. 10/10. Reliable. App is wonderful. Was so worth buying a more expensive one over a super cheap one.
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