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Description
Main Function
The Testo 425 is used for temperature measurement, wind speed measurement, and air volume calculation in ventilation ducts and air-conditioning systems. It helps check whether airflow is properly adjusted to maintain good indoor air quality.
Key Features
| Feature | Details |
|---|---|
| Brand | Testo |
| Product Model | Testo 425 |
| Product Type | Thermo-sensitive anemometer |
| Measurement Functions | Temperature, wind speed, air volume calculation |
| Application | Ventilation ducts and air-conditioning systems |
| Display | Backlit display |
| Reading Hold | Yes |
| Max / Min Display | Yes |
| Average Function | Multi-point / time average calculation |
| Probe Type | Thermal-sensitive wind speed probe |
| Probe Design | Retractable / telescopic handle |
| Maximum Extension | Up to 820 mm |
| Probe Diameter | 7.5 mm shown |
| Housing Material | ABS |
| Battery Type | 9V block battery, 6F22 |
| Weight | 285 g |
| Size | 182 × 64 × 40 mm |
Product Features
| Feature | Description |
|---|---|
| Temperature and Wind Speed Measurement | Measures air temperature and wind speed in ventilation ducts. |
| Air Volume Calculation | Automatically calculates air volume for HVAC system inspection. |
| Accurate Measurement | Designed for accurate airflow and temperature testing. |
| Easy to Use | Simple button layout and portable handheld body. |
| Hold Function | Freezes the reading for easy viewing and recording. |
| Max / Min Display | Displays maximum and minimum measurement values. |
| Backlit Display | Provides quick and clear readings in low-light areas. |
| Multi-point / Time Average Calculation | Supports average calculation for reliable airflow analysis. |
| Telescopic Handle | Extends up to 820 mm for duct and hard-to-reach measurement points. |
Application Scope
| Application Area | Details |
|---|---|
| Ventilation Ducts | Wind speed and air volume measurement |
| Air-Conditioning Systems | Functional airflow testing |
| Indoor Air Quality Checking | Helps verify proper air distribution |
| Low Wind Speed Areas | Suitable for low wind speed measurement |
| HVAC Maintenance | Useful for technicians during inspection and balancing |
| Commercial / Industrial Ventilation | Duct and airflow system checking |
Product Structure / Parts
| Part | Details |
|---|---|
| Main Instrument Body | Handheld Testo 425 meter |
| LCD Display | Shows measurement values and mean readings |
| Thermal Probe | Measures wind speed and temperature |
| Telescopic Probe Handle | Extends for duct measurement |
| Control Buttons | Power, display light, Hold, Max/Min, Vol, and Mean |
| Battery Case | Rear battery compartment |
| Housing | ABS body material |
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | Testo 425 |
| Operating Temperature | -20°C to +50°C shown |
| Storage Temperature | -40°C to +70°C shown |
| Battery Type | 9V block battery, 6F22 |
| Weight | 285 g |
| Size | 182 × 64 × 40 mm |
| Housing Material | ABS |
| Probe Type | NTC / thermal-sensitive wind speed probe |
| Temperature Range | -20°C to +70°C |
| Temperature Accuracy | ±0.5°C from 0°C to +60°C; ±0.7°C remaining range |
| Temperature Resolution | 0.1°C |
| Wind Speed Range | 0–20 m/s |
| Wind Speed Accuracy | ±0.03 m/s + 5% measured value |
| Wind Speed Resolution | 0.01 m/s |
| Probe Extension | Maximum 820 mm |
| Probe Diameter | 7.5 mm |
Main Benefits
- Temperature and wind speed measurement with air volume calculation
- Accurate measurement and easy operation
- Hold function for convenient reading
- Direct maximum / minimum value display
- Backlit display for quick and clear readings
- Telescopic probe for ducts and difficult locations
- Suitable for HVAC, ventilation, and indoor air quality checking
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