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Datasheet | Instruction Manual
Product Description
The Testo 425 is a compact, digital hot wire anemometer engineered for efficient, high-precision determination of flow velocity and volume flow within HVAC ventilation ducts. Featuring a cable-connected telescopic probe extending up to 820 mm, the device allows for rapid access in large-diameter ducts and overhead installations. Integration with the Testo Smart App enables wireless configuration, real-time graphical trend monitoring, and direct cloud documentation of measurement data.
Industry Applications
- HVAC System Commissioning: Balancing volumetric flow and velocity profiles in commercial and residential ventilation infrastructures.
- Industrial Duct Diagnostics: Rapid mapping of airflow patterns in complex ducting networks using the integrated telescopic probe.
- Energy Efficiency Audits: Continuous logging of air exchange rates and environmental compliance tracking in climate-controlled environments.
Key Features and Specifications
| Velocity Range | 0.01 to 30 m/s |
| Velocity Accuracy | +- (0.03 m/s + 4.0 % of mv) (0.01 to 20 m/s); +- (0.5 m/s + 5.0 % of mv) (20.01 to 30 m/s) |
| Temperature Range | -20 to +70 deg C (Accuracy: +-0.5 deg C) |
| Telescope Reach | Flexible telescopic probe extending up to 820 mm |
| Data Connectivity | Integrated Bluetooth for Testo Smart App synchronization and second display function |
| Protection & Battery | IP20 rating, up to 35 hours of autonomous operation on 3x AA batteries |
Package Contents
Testo 425 hot wire anemometer, telescopic probe (820 mm) with 1.5 m connection cable, 3x AA primary batteries, factory calibration protocol.