Cyanometer
Was $6.00
SAVE 42%
$3.50
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A cyanometer is a scientific instrument used to measure the blueness of the sky, originally invented in 1789 by Swiss physicist and Alpine explorer, Horace-Benedict de Saussuire. The 53 gradations of blue ranging from white to black. 3.75 x 5"Includes directions for use.
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$6
$3.50
(-$2.50)