For precise measurement of air quality and velocity, choose this data logging monitor from Testo. You can use this device with probes to assess various air parameters, including temperature and humidity. For convenient use, it automatically detects the probe that's connected to it, so you don't need to reset its parameters when you change the measuring apparatus. This monitor is Bluetooth-compatible for use with wireless probes, eliminating the need for a wired connection. The device's LCD (liquid-crystal display) screen can give parallel displays of three readings for quick and simple comparison of measured values.

• Internal memory of up to 7500 measurements for ample data storage
• Compact dimensions of 32 (length) x 65 (width) x 154mm (height) for handheld, portable use
• USB port for ease of connection to a computer

• Heating, ventilation and air conditioning (HVAC) systems
• Gas plants
• Sewage treatment facilities

This monitor is powered by three AA batteries with a lifespan of 12 hours for long-term portable use.