Humidity Indicator Cards

As a more precise alternative to indicating silica gel bags, we supply a range of Humidity Indicator Cards (HICs). Above all, they change colour at specific Relative Humidity within a customer’s sealed product pack. Therefore, they are particularly useful for customers who sell diagnostic test kits, where a demonstration of the test kit’s efficacy is required upon pack-opening.

They are used by manufacturers of pharmaceutical chemicals, and are also included in bulk containers of moisture-sensitive chemicals, where they are used as an indicator of the container’s integrity.

Simply speaking, if you see that the HIC has changed colour, then you know that the packed-product is probably affected, and needs checking.

We provide 2 formats for the HICs:

  • 1-Spot (with a single 8% indicator disc)
  • 6-Spot (with indicator discs for: 10%, 20%, 30%, 40%, 50% and 60% RH on a single card)


Benefits of Baltimore Humidity Indicator Cards (HICs):

Low-Cost …These are the most cost-effective humidity indicators on the market
Low Weight …so there is little or no need to consider additional pack size or pack weight
Simple …the colour change is very clear and hence easily understood by operatives and customers alike
Quality …we are an ISO:9001 accredited company, so you are assured of world-class products
Safe …Our easy to read blue-to-pink indicator cards are all 100% cobalt-free and therefore risk-free

For help with your Humidity Testing requirements or any other problems that you have, please give us a call on +44 (0)1628 531900.
If you prefer email, then send your question to and we will be very happy to help you…