Humidity indicator cards allow fast visual inspection of the relative humidity within sealed packaging and containers.
The indicators quickly and clearly change from blue to pink as relative humidity increases to unsafe levels. The cards
can measure RH levels from 5% to 60%.
range at 75°F:
Temperature correction factor:
Colour change data:
Vermason Ltd, 1 Avenue One, Letchworth, Hertfordshire SG6 2HB. UK
Page 1 of
HUMIDITY INDICATOR CARDS
Tel: +44(0)1462 672005 Fax: +44(0)1462 670440
51 x 76mm
5, 10, 15% RH
125 cards per litre can
Approved for method II packaging
Blotter paper IAW UU-P-63
Printing design: one colour, black ink
Indicator spots chemically impregnated onto blotter paper.
Manufactured IAW MIL-I-8835
2.5% RH per 10°F above or below baseline temperature of 75°F.
± 2.5% RH
Indicator spots change from a pink colour in humid conditions to blue at dry conditions.
Indicator spots are reversible.
5 years for an unopened unit container. Shelf life warranty applies only to the accuracy of
indicating spots. This warranty does not guarantee that all indicating spots will be blue upon
initial opening of the can.
For further information, please contact
FEC Part No 3026723 (BW906)
Code BW903, BW904, BW906
<0.1%, conforms to European directive 98/98.
Issue No 1
51 x 76mm
10, 20, 30, 40% RH
100 cards per pint can
Date : 30 April 2002
No: PIS 222
10, 20, 30, 40, 50, 60% RH
40 x 120mm
200 cards per litre can