Traceable® 4385TR Thermohygrometer with Dew Point and Alarm

Traceable® 4385TR Thermohygrometer with Dew Point and Alarm

The Traceable® Thermohygrometer with Dew Point and Alarm provides precise, simultaneous monitoring of temperature, relative humidity, and calculated dew point. Designed for laboratory, cleanroom, storage, and environmental applications, this instrument adds an out‑of‑range alarm and dew point calculation to the capabilities of model 37950‑01. A 3-foot remote sensor cable allows measurements in hard‑to‑reach areas, and RS‑232 output enables data transfer to a computer for documentation or analysis. Each unit is precalibrated to NIST‑traceable standards for guaranteed accuracy immediately upon use.

Key Features

• Microprocessor-based design for quick and easy calibration
• Simultaneously displays temperature and relative humidity
• Calculates dew point
• Out-of-range alarm for critical monitoring
• 3-foot cable for remote measurements
• RS‑232 output for data transfer
• Selectable °F/°C units
• Min/Max, Data Hold, memory storage, and auto-off
• Low-battery indicator
• Includes NIST-traceable certificate from A2LA accredited (1750.01) calibration laboratory
• 1-year warranty

More About This Item

The dual 1‑1/8″ high LCD display shows both temperature and humidity simultaneously for quick, at‑a‑glance monitoring. The instrument measures relative humidity from 10 to 95% and temperature from –20 to 50°C (–20 to 122°F). Dew point is automatically calculated based on current readings, providing additional insight into environmental moisture conditions.

The built-in alarm alerts users when readings fall outside programmed limits—ideal for controlled environments, storage rooms, HVAC systems, and quality assurance applications. Additional features include Min/Max memory, Data Hold, selectable °F/°C, auto-off, and a low-battery indicator.

Each Traceable® instrument includes an individually numbered Traceable® Certificate verifying accuracy from our ISO/IEC 17025:2017 (1750.01) calibration laboratory, accredited by A2LA. Measurements are traceable to SI units through NIST or other recognized national measurement institutes (NMIs) that are signatories to the CIPM Mutual Recognition Agreement.

Technical Specifications

• Min RH Range: 10%
• Max RH Range: 95%
• RH Accuracy: ±2% RH midrange; ±4% RH otherwise
• RH Resolution: 0.1%
• Temperature Range (°F): –20 to 122°F
• Temperature Range (°C): –20 to 50°C
• Temperature Accuracy: ±1°C between 0 to 40°C; otherwise ±2°C
• Temperature Resolution: 0.1°
• Response Time: 8 seconds
• Display Type: 3.5-digit LCD, 0.25″H
• Alarm: Yes
• Certifications: NIST-traceable
• Battery: 1 × 9V (included)
• Height: 7 1/8″
• Width: 2 3/4″
• Depth: 1/8″
• Description: Thermohygrometer with Alarm
• Warranty: 1 year

Included Accessories

• Traceable® Certificate
• Hard case
• Battery

This Traceable® Thermohygrometer with Dew Point and Alarm is ideal for laboratories, cleanrooms, environmental chambers, HVAC systems, and any application requiring accurate monitoring of temperature, humidity, and dew point with alarm protection and optional computer data output.

Guaranteed to have at least one year of calibration remaining on certificate.