IC3D Humidity Indicator Cards - 10-60% 6 Spot - 50 Card Pack

50-pack. This is a color-change reversible humidity indicator card made especially for IC3D. This indicator card has 6 indicating spots showing 10/20/30/40/50/60 percent relative humidity. The indication dots change from blue (dry) to pink (humid). Read the humidity level in the lavender area between the blue and pink. These adhesive-backed humidity indicators are a simple, cheap and great tool to assist you in keeping your valuables protected. These indicators are effective for about 6 months upon opening the shrink packaging. We at IC3D Printers, often use these in the environment where we do our 3D printing since 3D printer filament is typically made out of plastic that is hygroscopic (moisture absorbing). Every spool of experimental filament in our lab has one of these humidity indicator stickers.