At 73.5 degrees f blue spots will turn to a pink color at relative humidities as follows, top spot 65 pct, middle spot 40 pct, bottom spot 30 pct
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NSN 6135-01-633-8502
NSN 6135-01-098-3020
NSN 5920-00-201-4914
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NSN 5990-01-649-4647
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NSN 5950-01-391-9453
Last Updated: 08/13/2025