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This product is an accessory for the following products:

Testo 645 Humidity Meter
Long-term stable, highly accurate humidity sensor, data analysis using comSoft 3

This sensor metal protective cap is especially suited to cleanrooms, not suitable for dusty or high humidity environments G4, M04.\ The sensor is (slotted), Ø 12 mm, flow velocities of < 7 m/s,