SpO2 Sensor Tester  -  micro spectrometer

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Most LED faults are found in brand new sensors

Inaccuracy should never be an issue in new pulse oximeter sensors. But many are faulty right from the start: an area of particular concern is cheap foreign imports reaching the market in increasing numbers.
LEDs are the heart of the problem. Correct LED selection and matching is crucial to the accuracy of a new sensor. Sensors are particularly sensitive to errors in red wavelengths. Inappropriate handling during sensor manufacture and poor mounting of LEDs causes mechanical distortion and internal stresses which precipitate premature ageing and failure. This compounds any errors introduced during the selection process.

The example (left) shows why it’s crucial that the LIGHTMAN® should be used to evaluate every single sensor prior to purchase, as well as routinely throughout its life.

The example LED wavelength error, present in a newly manufactured sensor, can give SpO2 data with the following discrepancy:
                              at 97% SpO2 will be: +1.28%
                                  90%                           +3.23%
                                  80%                           +5.26%
                                  70%                           +7.27%