







From the brand








Made in USA, TruO2 OTC is the only fingertip oximeter that is accurate across varying skin pigmentations (1). Made with the same medical-grade pulse oximetry technology used in Nonin pulse oximeters for patients, clinicians, and the military, TruO2 OTC delivers readings you can count on.
Nonin’s founders, Phil Isaacson and his team of three engineers, were the original inventors of the fingertip pulse oximeter. Nonin’s exclusive technology is proven to deliver accurate measurements for a broad range of patients and conditions (2).
Cleared by the FDA for over-the-counter use—no prescription required. Rugged construction backed by a 2-year warranty (4). FSA/HSA eligible.
Equipped with Nonin PureSAT technology, TruO2 captures accurate oxygen and pulse rate measurements quickly (1).
Easy-to-read, LED display features clear digits and symbols
Nonin CorrectCheck technology notifies user immediately if the finger is not placed correctly in the device
Power turns on when applied, and off when finger is removed
Nonin SmartPoint capture algorithm determines when a high-quality measurement is ready to be wirelessly transmitted
Using a compatible iOS device, save and share readings with the Apple Health app, or send history by email through the NoninConnect App
Secure, cable-free connectivity to any compatible iOS device. Provides up to 2,200 spot checks on two AAA batteries included (3).
8 reviews for Nonin TruO2 OTC Pulse Oximeter Model 3250 FDA-Cleared, Over-The-Counter Medical Grade Wireless Fingertip Pulse Oximeter
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Original price was: $299.00.$26.99Current price is: $26.99.

C D –
Stable and accurate afaik
Good quality results. More stable than cheap oximeter.Wish they had a wrist monitor at this price point.
Tom Harvey –
Why buy an oximeter if it’s not accurate. This one is
This is a “medical grade” oximeter and that’s probably why it’s so expensive compared to most others at Amazon. Most others have accuracy issues so they are not approved for medical patients. Why but an use oximeter if it’s not giving your accurate numbers. I really like this one and use it at the gym when my exercise is dependent on my oxygenation. I have a type of lung disease and use it after each rep. Accuracy is key
KC Denton –
Pulse Oxyimeter
This Pulse Oximeter gives a fast, accurate reading. It has an easy to view screen. Long battery life. Only con is value. Overall, it gives peace of mind, so maybe that’s worth something.
wmf5 –
Works well.
I have had the device for approximately 2 weeks, and I use it every day. Its numbers come up very quick and seems to be very accurate. I have another older model to compare it with, and I certainly like the new one better. It did not come with a case. It should have for the amount of money it cost which was right at $300.00 bucks on Amazon.
jayme miner –
Great device!
I live in the rocky Mountains and have to check my oxygen saturation on a regular basis After dealing with unreliable results from my old, cheap oximeter, this device has been a real game-changer for me. Nonin’s TruO2 OTC is sturdy, and it gives accurate readings time and time again, so I know I can actually trust them. The peace of mind is worth every penny
I. Diaz –
Don’t spend the money!!
While the readings seem to be accurate, the issue is that it’s very frequent when the device can’t register a reading! As a respiratory therapist for the past 40 years, I have used a lot of pulse oximeters. The previous Nonin finger pulse oximeters were way better and I always got a reading with those. The $300 price tag on this newest version just isn’t worth it to me. The device is also very flimsy; I expect it to break soon.
Phyllis N –
Accurate and easy to use
Ease of use. Very accurate and durable. Even worked on my mom’s cold fingers. Much better than the cheaper ones that broke within a months of use.
Thomas Birdzell –
Costly and valuable
Amazingly Accurate