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Humidity indicator card

card on which a moisture-sensitive chemical is impregnated such that it will change color when the indicated relative humidity is exceede

Pronunciation
/hjuˈmɪdədi ˈɪndəˌkeɪdər kɑrd/
/hjʊˈmɪdɪti ˈɪndɪkeɪtə kɑːd/