This Humidity Indicator Card is a color-change indicator and is reversible as required by Military Specification MIL-I-8835. As the humidity increases, the chemically impregnated spots change from a blue color (DRY), through a lavender, to a pink color (HUMID). As the humidity decreases, the spots change from a pink color (HUMID), through a lavender, back to a blue color (DRY).
The MS20003-3 is accurate to ±5% relative humidity (RH) at 75°F (24°C). Other humidity combinations are available by special order.
NOTE: This card has been impregnated with a chemical that may cause corrosion of some metals; therefore AGM recommends that the card not be placed in direct contact with metal objects.
This card is used where space may be a problem. It is identical in design to the MS20003-2, except it is approximately 1/4 its size, making the MS20003-3 ideal for small package applications. NSN # 6685-01-008-7563.