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RH30: Hygro-Thermometer with Humidity Alert

Monitors Temperature, Humidity, and Dew Point Monitor with Audible/Visial Alarm

View Datasheet > RH30


Extech’s RH30 Hygro-Thermometer simultaneously measures and displays Temperature, Relative Humidity and Dew Point, allowing building managers and homeowners to monitor moisture content in the air in order to prevent mold growth. For mold that thrives in moist conditions and may be found in damp basements, closets, bathrooms, food storage areas, and other interior locations. Comes with desktop stand, 2 AA batteries, and user manual.

Additional information


Multi‐function LCD


Precision humidity sensor for quick and accurate readings

Measurement range

Relative Humidity: 1.0 to 99.0% RH

Air Temperature and Dew Point Temperature

‐10 to 50 °C (14 to 122 °F)


0.1 °C ( °F) and %

Temp. Accuracy

±1.0 °C (1.8 °F)

Power supply

2 x 1.5V AA batteries


95 x 25 x 95 mm (3.7 x 1.0 x 3.7")


90 g (3.2 oz.) instrument only, batteries not included in weight spec.

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