Hygrometer - Polytherm -Precision Hygrometer 2.75

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This Polytherm® 2.75" diameter hygrometer with plastic housing and a metal bezel around the dial offers a measuring scale from 20% to 100% relative humidity.

The normal humidity ranges, between 40% and 70%, are indicated on the scale.

Diameter 2.75", Depth 0.75"

Made in Germany