testo 440 Air Velocity and IAQ Measuring Instrument | Bluetooth probe support, measurement menus for volume flow, CO₂, temperature and humidity, 3 readings displayed simultaneously

testo 440 Air Velocity and IAQ Measuring Instrument: Multiple Probes, Measurement Menus

Overview

The testo 440 works with a range of digital probes to measure and record air velocity, volume flow and indoor air quality parameters, for adjusting HVAC ventilation systems, monitoring air quality and measuring comfort. It has built-in application measurement menus, and the large display can show 3 readings simultaneously. The main unit requires probes to operate; probes are sold separately.

Key Specifications

• Probe connections: 1 wired digital probe or NTC temperature probe; 1 Bluetooth digital probe or testo Smart Probe; 1 type K thermocouple
• Measurement menus: Volume flow, turbulence, heating/cooling load, mold detection, long-term measurement (e.g. CO₂)
• Main unit temperature: NTC −40 to 150 °C; type K thermocouple −200 to 1370 °C
• Data: Internal memory; USB export; Bluetooth
• Power: 3 × AA, approx. 12 h (typical vane measurement)
• Dimensions and weight: 154 × 65 × 32 mm, 250 g

Applications

• Duct volume flow and outlet air velocity measurement, indoor air quality and comfort assessment.

Specifications per the testo international (English) product page for the testo 440 main unit (0560 4401) (retrieved 2026-10-21).