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11
The device is equipped with two 1.5V AAA batteries, which
will allow the pulse oximeter to operate for approximately 30
hours.
2.5 Limitations
The pulse oximeter works by measuring the amount of oxygenated
hemoglobin in your blood over a period of time. Spot check pulse
oximeter takes 1-2 readings every second and takes an average of 4-6
readings before displaying the result. Hence, you will have to wait at
least 4-6 seconds before a result will be displayed on the monitor. If
the pulse oximeter fails to detect blood flow for the first few seconds,
the results will be delayed accordingly.
The pulse oximeter does not work for people with naturally small
fingers or low peripheral blood flow. This is because the pulse
oximeter could not detect enough blood for a measurement. Please
note that prolonged use of a pulse oximeter, hypotension,
vasoconstriction, hypothermia and certain medications can lead to
low or restricted blood flow. Nail polish can also impede the pulse
oximeter from taking a reading. To know how much blood flow is
being detected by the pulse oximeter, you will need a model that can
display the plethysmograph (Model 500D). Finally, it is generally
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