sphygmomanometer
The correct spelling is "sphygmomanometer."
The correct spelling is spectroscope. A spectroscope is a scientific instrument that is used to measure properties of light waves. It is an optical device for producing and recording spectra to be examined.
The correct spelling of the adjective, from measure, is measurable (weighable, quantifiable).
There is no single instrument for either of these things
The correct spelling is thermometer (device to measure temperature).
The correct spelling is "ammeter" (electrical device to measure current).
The correct spelling is the plural measure kiloliters(thousands of liters).
That is the correct spelling of the (plural) word "bushels" (a farm crop measure).
The correct spelling is standard (usual, customary, or the norm; a base measure).
The correct spelling of the abbreviated oz. as a unit of measure is ounces or ounce.
The correct spelling is "breathalyzer" (device to measure body alcohol, notably for drivers).
The correct spelling is "permanently" (for good, forever).
The correct spelling is "measure" (a quantitative value, or to assess a dimension, size, or quantity).