Testo 400 Universal HVAC/IAQ Measuring Instrument with Humidity, CO2, and Lux Probes 0560 0400 01

Indoor air quality directly affects comfort, productivity, and health—yet measuring it accurately often requires multiple instruments and tedious setup. The Testo 400 Universal HVAC/IAQ Measuring Instrument streamlines this by combining temperature, humidity, CO2, and light measurement into one professional system.

Who is it for

HVAC technicians, facility managers, and indoor air quality consultants who need reliable, on-site documentation of environmental conditions. Its high-precision probes and touchscreen interface make it suitable for both spot checks and long-term monitoring.

Main features

• 5-inch HD touch display for intuitive operation and clear data visualization.
• Includes high-precision humidity/temperature probe (0636 9740), CO2 probe (0632 1551), and lux probe (0635 0551).
• Measures temperature, relative humidity, CO2 concentration, and illuminance simultaneously.
• 8 GB internal memory stores up to 100,000,000 readings for extensive logging.
• Bluetooth, WLAN, and USB connectivity for data transfer and remote monitoring.
• Rechargeable Li-ion battery provides up to 8 hours of continuous operation.
• On-site report generation in PDF or Excel format for professional documentation.

Specifications

• Instrument operating temperature: -5 to +45 °C
• Humidity measurement range: 0 to 100 %RH
• Probe temperature measurement range: -20 to +70 °C
• CO2 measurement range: 0 to 10,000 ppm
• Lux measurement range: 0 to 100,000 Lux
• Kit includes tripod, system case, USB cable, mains unit, and calibration protocol

Tips

For accurate readings, allow the probes to acclimatize to the environment for a few minutes before logging. Use the tripod for stable placement during long-term monitoring sessions.