Since 1998 Levosil produces brown cobalt free humidity indicators which are 100% cobalt free.
Our humidity indicators are made up of a card soked with a chemical substance which chenges its color from brown to teal blue when it reaches a specific RH level (i.e. 30%-40%-50%)
Our brown cobalt free humidity indicators comply with Jedec 0033 standards.
In addition to cobalt free humidity indicators, Levosil S.p.A. also produces cobalt dichloride free humidity indicators. The color change is from blue to pink.
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