Maximum indicator cards retain evidence of sustained humidity exposure during storage and transport. Their blue crystals form permanent blue spots after exposure above a marked threshold for 24 hours or more. MXC56789 also provides a separate reversible current-humidity scale.

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  • MX345 humidity indicator card - supplier illustration

    MX345 Maximum Humidity Indicator Card

    Code: MX345

    Indicator levels:
    30, 40, 50% RH
    Indicator Behaviour:
    Non-reversible maximum humidity record
    Indicator Colour Change:
    Blue crystal dissolves to form a large blue spot
  • MX56789 humidity indicator card - supplier illustration

    MX56789 Maximum Humidity Indicator Card

    Code: MX56789

    Indicator levels:
    50, 60, 70, 80, 90% RH
    Indicator Behaviour:
    Non-reversible maximum humidity record
    Indicator Colour Change:
    Blue crystal dissolves to form a large blue spot
  • MXC56789 humidity indicator card - supplier illustration

    MXC56789 Maximum Humidity Indicator Card

    Code: MXC56789

    Indicator levels:
    50, 60, 70, 80, 90% RH
    Indicator Behaviour:
    Non-reversible maximum record plus reversible current humidity indication
    Indicator Colour Change:
    Blue crystal dissolves to form a large blue spot; reversible current-humidity scale