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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.
Larry C Arndt
Reviewed in the United States on March 3, 2025
Easy to use
Happy
Reviewed in the United States on March 1, 2025
As described
D. Beach
Reviewed in the United States on February 3, 2025
This unit is extremely well-built, comes with a case and protective cover, and lanyard. It synced instantly with my iPhone, so that bit integrates smoothly with Apple Health. There is no indication in the instructions about where to download the App that is required for phone integration. Once found, and opened, the results are immediately recognized by Apple Health. My doctor recommended that I have one. This is perfect for my needs and setup was fast and smooth.
Chameleon2
Reviewed in the United States on June 7, 2024
Unit appears to be very well made; display is very sharp and clear - easy to read.I can’t speak to its accuracy, aside from comparing results with my Apple Watch 7. The 500E-B reads either the same or slightly lower than the watch. I get my “specs” checked often at doctors offices (lots of health issues) and from this my feeling is the 500E-B provides a good way of self monitoring in between visits if someone feels the need.
Kindle Customer
Reviewed in the United States on June 2, 2024
Pulse readings seem to be accurate when checked against oximeters at the doctors office and at rehab center, oxygen readings read 4-5 points below. This is the second unit I have bought that read the same way from 2 different brands. I also purchase an inexpensive unit from another company that is accurate.
Billie K. Fuller
Reviewed in Australia on February 5, 2024
Easy to use. Seems to be accurate. Does everything it claims.
TR
Reviewed in the United States on December 5, 2024
Purchased for it's Bluetooth capability. App is easy to use, and set up.
Michelle Matthews
Reviewed in the United States on December 4, 2024
I recommend to have on hand . Especially if you are on oxygen. Works Great!!!
Wytchie
Reviewed in Australia on August 25, 2021
I was very pleased with the overall quality of the meter. It is well made, comes with a rubber cover for protection fro the elements and a very sturdy velcro closing nylon carry case. Also supplied is an easily fitted, strong lanyard. The instructions are easy to follow and simple, yet go further to in depth explanation of how the device functions and operates. The cradle for the finger is comfortable and I had no trouble getting a reading. It is accurate alongside other meters and very easy to read. It requires 2 AAA batteries, which were supplied in a sealed package. There are multiple read formats to suit most. The price is very reasonable and delivery was sooner than stated. It was packaged well and arrived in excellent condition. I would recommend this little unit to anyone who might have need for one. I am now more confident that I can assess my heart rate and blood oxygen saturation on a very regular basis.
Buyer 0
Reviewed in Singapore on May 16, 2021
Good product
Monti
Reviewed in Singapore on May 10, 2021
Delivered With One working Day. Excellent quality and reasonable rate. Five 🌟
chasmunch
Reviewed in the United States on July 31, 2020
Arrived on time in perfect condition. Had excellent feedback comments. I was a little wary as it was under $12. bucks to my door. I recently took this to my pulmonary walking test and compared numbers to the hospital's state of the art device. The pulse was the same throughout the walking test. The saturation number was low, BUT consistently by 3 points...so now I know accurately what my oxygen saturation is simply by adding 3 points. If you need such a "tool", get this one. Come with a protective woven nylon case so it's safe to throw in my backpack. buy without hesitation.
Ismael
Reviewed in Mexico on January 19, 2020
Uso médico hasta el momento excelente
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