Testo 420 Differential Pressure Measuring Instrument, -120 to +120 Pa, with Bluetooth and USB 0560 0420

Differential pressure measuring instrument for precise measurements from -120 to +120 Pa, with integrated flow straightener and magnetic attachment for hands-free operation. The Testo 420 combines high accuracy with Bluetooth connectivity for the Testo Smart App, enabling convenient data logging and analysis.

Advantages

High accuracy of ±(0.5 Pa + 1% of mv) in the 0-25 Pa range and ±(0.5 Pa + 1.5% of mv) in the 25-120 Pa range. Integrated flow straightener ensures stable readings even in turbulent airflows. Magnetic attachment allows the instrument to be mounted on metal surfaces, freeing both hands for probe positioning. Bluetooth and USB connectivity enable easy data transfer and remote monitoring via the Testo Smart App.

Suitable for

• Cleanroom differential pressure monitoring
• Ventilation system testing and balancing
• Filter pressure drop measurement
• Flow velocity measurement with Pitot tube
• Volume flow calculation in ducts

Key specifications

• Differential pressure range: -120 to +120 Pa
• Accuracy (0-25 Pa): ±(0.5 Pa + 1% of mv)
• Accuracy (25-120 Pa): ±(0.5 Pa + 1.5% of mv)
• Resolution: 0.001 Pa (0-25 Pa), 0.01 Pa (25-120 Pa)
• Flow velocity range (Pitot tube): 0.1 to 100 m/s
• Volume flow range: 0 to 99999 m³/h
• Operating temperature: 0 to +50 °C
• Storage temperature: -20 to +60 °C
• Battery type: 3 x AA Mignon batteries
• Battery life: approx. 120 hours (without backlight)
• Display: Graphic LCD
• Internal memory: up to 10,000 measurement values
• Connectivity: USB, Bluetooth
• Units: Pa, hPa, m/s, m³/h, °C, °F, %RH, ppm
• Special features: integrated flow straightener, magnetic attachment, timed and multi-point averaging
• Protection class: IP40

Recommendations

Ideal for HVAC technicians and cleanroom operators requiring precise low-pressure measurements with data logging. The magnetic attachment and Bluetooth connectivity streamline field work, while the high resolution ensures reliable readings in critical environments.