For humidity indicator plugs, before reaching the 35-45% RH range, what color are they?

For humidity indicator plugs, before reaching the 35-45% RH range, what color are they?

• A. Blue
• B. Pink
• C. Green
• D. Yellow

Answer: (A)

Humidity indicator plugs use a color-changing element to show moisture levels. When the air is dry, the indicator is blue; as humidity rises, the color shifts toward pink. Since 35-45% RH is still relatively dry, the plug would appear blue before reaching that range. If pink appears, that signals higher humidity and the need to address moisture. Other colors such as green or yellow aren’t the standard indication for these plugs.

Humidity indicator plugs use a color-changing element to show moisture levels. When the air is dry, the indicator is blue; as humidity rises, the color shifts toward pink. Since 35-45% RH is still relatively dry, the plug would appear blue before reaching that range. If pink appears, that signals higher humidity and the need to address moisture. Other colors such as green or yellow aren’t the standard indication for these plugs.