Extech RH390 Precision Psychrometer with Humidity, Temperature, Dew Point and Wet Bulb – Dual Probe Digital Meter with High Accuracy, Fast Response, Large LCD Display

The Extech RH390 Precision Psychrometer is built for professionals who demand fast, accurate, and versatile environmental measurements. This advanced handheld meter monitors humidity, temperature, dew point, and wet bulb with exceptional accuracy, ensuring reliable results for critical applications. Featuring both a built-in probe and an external wired probe, the RH390 allows for dual-location readings, perfect for comparing conditions inside ducts, across rooms, or between indoor and outdoor environments. Its quick-response sensors deliver stable data in seconds, cutting down waiting time during inspections. The large backlit LCD display presents multiple parameters simultaneously, making it easy to analyze conditions on the spot. Rugged, portable, and powered by standard batteries, the RH390 is ideal for HVAC technicians, building inspectors, industrial hygienists, and laboratory professionals who need trusted performance in the field.

• Professional Precision in Every Reading – Measures relative humidity, ambient temperature, dew point, and wet bulb with high accuracy, giving technicians confidence in every inspection or field test.
• Dual Probe Advantage for Versatility – Includes both built-in and external probes for simultaneous readings in multiple locations, making it ideal for HVAC diagnostics, laboratories, and building inspections.
• Fast Response Time That Saves You Work Hours – Designed with advanced sensors to deliver rapid, stable results in seconds so you spend less time waiting and more time troubleshooting and reporting.
• Clear Display for Smarter Decisions – Large backlit LCD shows multiple parameters at once, even in dim conditions, helping professionals quickly compare values without juggling separate devices.
• Rugged, Portable, and Ready for the Field – Compact handheld design with protective case ensures durability, while battery power and data hold functions make it convenient for on-site and outdoor use.