Extech RH350-CAL Humidity Calibration Kit:

The Extech RH350-CAL Humidity Solution Kit is a calibration kit for Extech humidity indicators and is designed for use with Extech RH350 Hygro-thermometer psychrometer. The RH350-CAL includes two bottles-- one at 33% RH and the other at 75%. These bottles are designed to fit snugly around the sensor for accurate calibrations

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