Start by replacing the batteries with fresh ones!
* **No Reading or Inaccurate Results?**
* **Finger Placement:**
* Ensure finger is fully inserted, resting flat on the sensor.
* Keep hand and finger completely still during measurement.
* Try a different finger (index or middle finger usually works best).
* **Finger Condition:**
* Remove any nail polish, artificial nails, or dirt.
* Warm up cold fingers before use (rub hands together).
* Ensure good circulation to the finger (no tight rings).
* **Ambient Light:**
* Avoid direct bright light shining onto the sensor.
* **Clean Sensor:**
* Gently wipe the inside of the finger chamber with a soft, dry cloth.
* **Device Won’t Turn On?**
* **Batteries:**
* Verify batteries are inserted with correct polarity (+/-).
* Ensure the battery compartment lid is closed securely.
* Always try a *brand new* set of batteries.
* **Seeing “Error” or “Finger Out” Messages?**
* **Re-insert Finger:**
* Remove and re-insert your finger firmly and fully into the device.
* **Reduce Movement:**
* Stay as still as possible; any movement can disrupt the reading.
* **Warm Fingers:**
* Cold fingers can sometimes trigger these messages due to poor signal.
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