Heat Index Psychrometer

Extech RH25 Heat Index Psychrometer

Pocket-sized environmental safety monitoring for proactive heat stress prevention.

The Extech RH25 is a highly compact, pen-style psychrometer designed for site supervisors, athletic trainers, and occupational health officers who need to continuously monitor environmental conditions on the go. Engineered to prevent heat-related injuries during outdoor activities or in hot indoor workplaces, this portable instrument features a built-in multi-parameter sensor that not only measures ambient temperature and humidity but directly calculates the Heat Index and Wet Bulb Globe Temperature (WBGT).

By taking the guesswork out of environmental safety, the RH25 provides a highly accurate representation of how hot it actually feels to the human body, allowing professionals to quickly establish safe work-rest cycles without being weighed down by heavy equipment.

Key Technical Capabilities

• Comprehensive Heat Metrics: Automatically calculates Heat Index (factoring humidity with temperature) and WBGT (factoring in the effects of direct/radiant sunlight) for true heat stress evaluation.

• Multi-Parameter Psychrometrics: Simultaneously measures and displays Ambient Temperature, Relative Humidity, Dew Point, and Wet Bulb alongside heat index parameters.

• Programmable Safety Alarms: Features a user-adjustable Heat Index/WBGT visual and audible alarm, instantly notifying users when conditions cross into hazardous thresholds.

• Ultra-Portable Form Factor: The lightweight (50g), pen-sized design easily clips into a shirt pocket or rests on a lanyard, making it incredibly convenient for active daily carry.

• Diagnostic Data Features: Includes Min/Max/Average value recording to track peaks throughout the day, a Data Hold function, and an auto-power-off feature to preserve battery life.

Technical Specifications Summary

Equip your personnel with proactive, pocket-sized heat stress monitoring