Indicates both the current humidity and maximum humidity attained.
Individually sealed in a clear moisture-barrier bag with dessicant to keep the card dry and provide an extended shelf life.
Current range is 0 to 100% relative humidity.
Readable to an accuracy of ±5% RH at 24°C.
Maximum memory range is 50 to 90% RH. (For crystals to dissolve properly, the humidity must be maintained at or above the indicated value for a minimum of 24 hours.)
Colour changes from blue to lavender in increments of 10% RH.
Use with bottles, chemicals, plastic bags, electronics, dessicators and storage containers.
Reversible indicator changes color as the humidity increases and decreases.