Nonin TruO2 3250 OTC Fingertip Pulse Oximeter
- FDA cleared for OTC home use, no prescription required
- Accurate across skin tones, PureSAT for low circulation and cold fingers
- Up to 2,200 spot checks on two included batteries
- Bluetooth to compatible iOS devices, Apple Health via NoninConnect
- LED display with automatic on/off
- 2-year warranty, made in USA
Updated 20 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A medical-grade fingertip oximeter built for reliable readings across skin tones and in cold fingers, with app logging. Phone pairing is described for iOS only, so Android users lose the data sharing.
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ASIN: B0DNNVNYMCModel: TruO2 OTC 3250Category: Pulse Oximeters
Overview
Clipping onto a fingertip, the Nonin oximeter takes optical spot checks of blood oxygen saturation and shows the result on a bright LED display. Readings can be sent over Bluetooth to the NoninConnect app for saving, sharing with Apple Health or emailing.
Clinical technology in a home device is the reason to own it, especially for people whose readings are affected by skin tone or poor circulation. CorrectCheck alerts when the finger is placed wrong. App features are tied to iOS, and the listing describes spot checks, not overnight monitoring.
Who it's for
People checking oxygen at home, including those with darker skin or cold hands, get readings built on the technology clinicians use. Android users and anyone needing overnight alarms should look at a different model.
Pros and cons
- Accuracy across skin tones stated
- Works with cold fingers and low perfusion
- CorrectCheck flags poor finger placement
- Long battery life in spot checks
- App sharing listed for iOS only
- Battery type listed as both AA and AAA
- Spot checks only, no continuous mode described
Performance notes
Reading quality depends on finger position and blood flow at the fingertip. PureSAT processing is designed to hold accuracy when circulation is low or fingers are cold, and CorrectCheck warns when the finger is misplaced. The optical sensor reads through the skin, which is why skin tone accuracy matters.
Specifications
| Brand | Nonin |
|---|---|
| Model | TruO2 OTC 3250 |
| Dimensions & fit | |
| Item Dimensions L X W X H | 1.2 × 1.7 × 2.5 inches |
| Size | 1.25 x 1.75 x 2.5" |
| Construction & materials | |
| Color | Black |
| Material Type | Plastic |
| Compatibility & installation | |
| Compatible Devices | Smartphones |
| Included components | |
| Included Components | TruO2 OTC Pulse Oximeter, 2AA Batteries |
| Warranty & support | |
| Software Update Supported To Date | unknown |
| Other details | |
| Sensor Type | Optical |
| Number Of Items | 1 |
| Item Highlight | FDA Cleared, Made In USA, Accurate Across All Skin Tones, Medical Grade, Bluetooth, App Enabled |
Frequently asked questions
What batteries does the Nonin TruO2 use?
The feature list says two included AAA batteries, while the included components list says 2AA batteries. Both say batteries come in the box; confirm the size before buying spares.
What happens if my finger is not placed correctly in the Nonin TruO2?
Nonin CorrectCheck alerts you when your finger is not positioned correctly for a high-quality measurement.
Is the Nonin TruO2 a continuous overnight monitor?
The listing describes spot checks, not continuous or overnight monitoring, and names no alarms.