Cyanometer Postcard
A cyanometer is a tool that lets you grade the blueness of your sky, invented in 1789 by Horace Bénédict de Saussure.
This genius modern version is combined with a postcard! Simply hold up to the sky, look through the hole and then on the back write the time & shade number. Pop in the post to a friend. 148x105mm
Simple brilliance by Macarena Ruiz-Tagle.
Select Sky Type
From $1.75
Original: $5.00
-65%Cyanometer Postcard—
$5.00
$1.75
Description
A cyanometer is a tool that lets you grade the blueness of your sky, invented in 1789 by Horace Bénédict de Saussure.
This genius modern version is combined with a postcard! Simply hold up to the sky, look through the hole and then on the back write the time & shade number. Pop in the post to a friend. 148x105mm
Simple brilliance by Macarena Ruiz-Tagle.
