This reversible color-change Humidity Indicator Card (24873327681) is designed to meet the new version of J-STD-033 (the standard governing the use and testing of Humidity Indicator Cards in the dry packaging of semiconductors). The JEDEC-approved cards adhere to a standard, minimum color-change quality level to ensure accuracy and readability between dry and humid states.
Whereas previous cards used a 5, 10 and 15% relative humidity (RH) spot system to indicate humidity exposure levels for moisture sensitive components, the new cards feature spots indicating 5, 10 and 60%. The change means that cards will now indicate humidity exposure for Level 2 MSL devices.
Additionally, a positive reading on the 60% spot indicates that cards should not be reused, as the high level of humidity to which the card has been exposed will jeopardize the accuracy of low readings (5% RH).