HTC HD-303 Mini Hygrometer

HTC HD-303 Mini Hygrometer

The HTC HD-303 Mini Hygrometer is a compact and professional temperature and humidity meter designed for accurate environmental monitoring. It measures relative humidity, ambient temperature, dew point, and wet bulb temperature, making it an ideal instrument for HVAC professionals, laboratories, pharmaceutical facilities, warehouses, cleanrooms, greenhouses, and industrial maintenance. Its ergonomic handheld design, backlit LCD display, and advanced measurement functions ensure reliable performance in both field and indoor applications.  

Key Features

• Measures Relative Humidity (RH) and Ambient Temperature simultaneously.
• Calculates Dew Point and Wet Bulb Temperature.
• Wide humidity measurement range from 0.0% to 99.9% RH.
• Temperature measurement range from -20°C to 60°C (-4°F to 140°F).
• Large backlit LCD display for clear visibility.
• MAX/MIN value recording.
• Data Hold function for easy reading.
• Selectable °C / °F temperature units.
• Fast sampling rate of approximately 2.5 readings per second.
• Automatic Power Off (APO) to conserve battery life.
• Lightweight and portable ergonomic design.

Technical Specifications

Parameter  Specification

Humidity Range : 0.0% to 99.9% RH

Humidity Resolution : 0.1% RH

Humidity Accuracy : ±3.0% RH (20–80% RH), ±4.0% RH (outside range)

Temperature Range : -20°C to 60°C (-4°F to 140°F)

Temperature Resolution : 0.1°C / 1°F

Temperature Accuracy : ±1.5°C

Dew Point Range : -50°C to 60°C

Wet Bulb Range : -20°C to 60°C

Sampling Rate : 2.5 times/second

Display : Backlit LCD

Power Supply : 3 × AAA Batteries

Auto Power Off : Yes (Approx. 30 minutes)

Dimensions : Approx. 138 × 56 × 25 mm

Weight : Approximately 88 g

Applications

• HVAC installation and maintenance
• Pharmaceutical manufacturing
• Laboratories and research facilities
• Cleanrooms and controlled environments
• Warehouses and storage facilities
• Greenhouses and agriculture
• Museums and archives
• Food processing and cold storage
• Indoor environmental monitoring

Benefits

• Provides four essential environmental measurements in a single handheld instrument.
• High-accuracy humidity and temperature readings for reliable monitoring.
• Dew point and wet bulb calculations help assess moisture and condensation risks.
• Compact and lightweight for convenient field use.
• Backlit display allows operation in low-light environments.
• Data Hold and MAX/MIN functions simplify inspection and documentation.
• Energy-efficient design with automatic power-off for longer battery life.

Package Contents

• HTC HD-303 Mini Hygrometer
• Soft Carrying Case
• User Manual
• 3 × AAA Batteries (model/package dependent)

The HTC HD-303 Mini Hygrometer is a dependable handheld environmental meter that combines humidity, temperature, dew point, and wet bulb measurements in one compact device. Its portability, accuracy, and professional features make it an excellent choice for technicians, laboratory personnel, HVAC engineers, and quality control professionals who require precise environmental monitoring.