Non-Reversible Humidity Indicator Cards

Humitector™ Maximum Humidity Indicator Cards

offer a simple, cost-effective, and accurate method of recording maximum relative humidity. The irreversible humidity indicator cards are designed for applications that require monitoring of the maximum relative humidity that moisture-sensitive products have been exposed to during storage and transport. Applications range from shipping and transport of sensitive products, to storage and preservation of valuable artifacts.

Humidity indications range from 30% to 90% relative humidity. Each level of humidity indicated is represented by a blue crystal that dissolves when the relative humidity level exceeds the value shown. When the crystal dissolves, an unmistakable large blue spot is seen. The card cannot be reactivated, so it provides a non-alterable record of the maximum humidity goods or products have been exposed to.

These are two of our most popular cards:

MX56789

Indicates 50, 60, 70, 80 & 90% Relative humidity.
50 cards per gallon can

MXC56789
Indicates 50, 60, 70, 80 & 90% Relative Humidity.

Has an additional attached reversible indicator to show current humidity.
25 cards per gallon can

These humidity indicator cards and more can now be purchased securely online
by visiting our Online Catalog - Humidity Indicator Card Section.

Please contact us if we can help you find the exact product to fit your needs.

Note: These humidity indicator cards should be considered a "one-time" card. They are not reversible, once the crystals have been exposed to excess moisture and dissolved they will not change. These humidity indicator cards cannot be reactivated to show a lower humidity level than the maximum recorded. Please see our section of reversible humidity indicator cards if you need a changeable indicator.