1 Capillary Refill: Push on the tip of the great toe or the nail bed until blanching occurs. 2  Then release and note how long it takes for the red color to return, a reflection of blood inflow to the distal aspect of the lower extremity. Pulses are rated on a scale ranging from 0 (not palpable) to 2+ (normal). 2  As with edema, this is very subjective and it will take you a while to develop a sense of relative values. 3  In the event that the pulse is not palpable, the doppler signal generated is also rated, ranging again from 0 to 2+.
Just how small is ânano?â In the International System of Units, the prefix nano means one-billionth, or 10-9; therefore one nanometer is one-billionth of a meter. The illustration below has three visual examples of the size and the scale of nanotechnology, showing just how small things at the nanoscale actually are.
There are 1.0E-9 meter in a nanometer. 1 Nanometer is equal to 1.0E-9 Meter. 1 nm = 1.0E-9 m. Used mostly for scientific purposes, a nanometer is a unit of length which equals to 1 / 1,000,000,000th of a meter. It is a Si unit with the symbol of nm. It is also known as millimicron.