What the Nonin TruO₂ 3250 is intended for
The US instructions describe an over-the-counter fingertip pulse oximeter for estimating SpO₂ and pulse rate in adults. It is intended for spot checks. The stated finger thickness is 8 to 25 mm.
- Intended use
- Spot checks for adults 18 and older.
- Fit
- Finger thickness of 8–25 mm.
- Identification
- Nonin TruO₂ OTC, model 3250.
US clearance and the 3250 instructions cover adults 18 and older for checks without motion. The unit turns on when you insert your finger and shows estimated oxygen saturation alongside pulse rate. Check orientation in the manual. On this model the display faces the palm side of the finger.
What CorrectCheck tells you
The CorrectCheck indicator helps flag incorrect positioning. If you see it, adjust the finger placement as shown in the manual. Keep your hand still while the reading settles.
If CorrectCheck appears, center your finger and insert it fully as shown in the instructions. Dashes appear when the unit cannot display a usable signal. Keep your hand still and check placement and whether the finger is cold before trying again.
When a different format makes sense
This model displays the result and is intended for spot checks. If you need to record sessions or use a sensor for a child, check which devices document that use and the ages they support.
Nonin documents a Bluetooth connection to NoninConnect on compatible iOS devices for logging spot checks. If you plan to use the app, check phone compatibility before buying. The instructions describe the device for spot checks and state that it has no alarms.
What to check before buying
Check the Amazon.com listing for Nonin TruO₂ OTC 3250 and the exact variant before ordering. Delivery and availability depend on the offer and your ZIP code.
Look for TruO₂ OTC and model 3250 on the listing and in the instructions. If you are comparing two Nonin oximeters, use each model number to look up its instructions, app support, and finger fit limits.