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Extech RH300 Hygro-Thermometer Psychrometer

Extech | Humidity Meter

Extech RH300 Hygro-Thermometer Psychrometer

MPN / Part No: RH300
Price updated: Sep 23, 2026

The Extech RH300 Hygro-Thermometer Psychrometer is an accurate instrument for simultaneously measuring relative humidity, dry bulb temperature, wet bulb temperature, and dew point in industrial and laboratory environments. This device features the ability to connect to an external temperature probe, enabling precise monitoring of environmental and process conditions for engineers and technicians.

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Extech RH300 Hygro-Thermometer Psychrometer is an advanced and reliable measuring instrument for assessing vital environmental parameters, including relative humidity, dry bulb temperature, wet bulb temperature, dew point, and specific humidity.

This device utilizes precise sensors and advanced computational algorithms to provide accurate data for analyzing climatic conditions and monitoring environmental quality.

Its ergonomic design and robust body make it an ideal choice for use in industrial environments, laboratories, HVAC systems, and scientific applications.

One of the distinguishing features of the RH300 model is its capability to measure temperature via an external probe, which allows the user to monitor the temperature of different points or remote environments.

This feature is extremely valuable for applications requiring the measurement of surface temperatures or liquids. The high accuracy and rapid response of this device expedite quality control and troubleshooting processes, aiding in more precise decision-making.

Key Features of Extech RH300 Hygro-Thermometer Psychrometer

  • Simultaneous measurement of relative humidity, dry bulb temperature, wet bulb temperature, and dew point
  • Capability to connect to an external temperature probe for measuring temperatures at remote points
  • Psychrometer design for accurate humidity measurements with air flow
  • Large, easy-to-read digital display for convenient data viewing
  • High accuracy and good repeatability for industrial and laboratory applications
  • Durable body and ergonomic design for easy and prolonged use

Technical Specifications

FeatureValue
BrandExtech
ModelRH300
Device TypeHygro-Thermometer Psychrometer
Measurable ParametersRelative humidity, dry bulb temperature, wet bulb temperature, dew point
External ProbeYes (for temperature measurement)
DisplayDigital
ApplicationIndustrial, laboratory, HVAC

Frequently Asked Questions

Is this device suitable for measuring humidity in humid environments?

Yes, the RH300 model accurately measures humidity across a wide range of environmental conditions, including humid environments, using shadow technology. However, to maintain long-term accuracy, it is recommended to care for the device according to calibration instructions.

Is it possible to recalibrate the Extech RH300 Hygro-Thermometer Psychrometer?

Yes, like all precision industrial instruments, the RH300 Hygrometer requires periodic calibration. Extech offers certified calibration services, or you can send the device to authorized calibration centers to ensure its accuracy.

What is the main difference between this model and regular hygrometers?

The main difference lies in the simultaneous measurement of dry bulb and wet bulb temperatures and the calculation of the dew point. Additionally, the presence of an external probe for temperature measurement expands the application range of this device compared to simple hygrometers.

Conclusion

The Extech RH300 Hygro-Thermometer Psychrometer is an excellent choice for engineers, HVAC technicians, and environmental quality control specialists who require accurate and reliable data.

By combining advanced humidity and temperature measuring capabilities, this device helps you to accurately monitor environmental conditions and make better decisions to maintain workplace quality and safety.

If you are looking for an accurate, durable, and versatile tool, the RH300 is an ideal option for your industrial and laboratory needs.

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Extech

Extech

United States

Extech is one of the most reputable international brands in the field of test and measurement equipm...

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