The black fruit makes them look like Blackberries, though this is only superficial, with the taste being unique and not like either red raspberry or blackberry. In much of the Mid-Atlantic United States, black raspberries are simply called Blackberries, even though they are not. Hybrids between red and black raspberries are common under the name purple raspberries; âBrandywineâ, âRoyaltyâ and âEstateâ are examples of purple raspberry cultivars.
In the finger is an artery which carries the blood the pulse oximeter is interested in and a vein through which the blood leaves the finger. Below the finger is the light detector. Physical property No.1 : Amount of light absorbed is proportional to the concentration of the light absorbing substance
What does a pulse oximeter measure? 1  The oxygen saturation of haemoglobin in arterial blood-which is a measure of the average amount of oxygen bound to each haemoglobin molecule. 2  The pulse rate-in beats per minute, averaged over 5 to 20 seconds. The oxygen saturation of haemoglobin in arterial blood-which is a measure of the average amount of oxygen bound to each haemoglobin molecule. 2  The percentage saturation is given as a digital readout. 3  The pulse rate-in beats per minute, averaged over 5 to 20 seconds.