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This product is an accessory for the following products:

Rotronic HygroLog NT Series Data Loggers
Humidity and temperature data logger utilizing interchangeable HygroClip 2 probes

The Rotronic in-line binder 4-pin male connector is designed for connecting 3rd party analog or digital devices to the docking stations. The ET-409 plugs it into the Rotronic HygroLog NT Series docking station and serves as a wiring adapter for external 3rd party sensors.