50x Humidity Indicator 9-Point 10-90% RH Blue-Purple

Moisture indicator card, 9-point, 10–90% RH

For checking room humidity during storage and in display cases
Cobalt dichloride-free

Dimensions: 115 x 39 mm
Packaging unit: 50 pieces

Blue = dry
Purple = humid

Material: Cobalt bromide on cardboard
Packaging unit: 50 pieces

For climate verification (practical accuracy is less than 10% RH):
The paper strips are treated with different cobalt bromide solutions.