Compact instrument with humidity probe head for measuring air moisture and temperature.

2 line backlit display
Displays temperature and relative humidity / wet bulb temperature / dewpoint
Max/min & Hold functions
Hold button to freeze readings
Display light
Auto Off function
2 year guaranteed long-term stability
Approximately 70 hours operation provided by 9V PP3 battery (without radio operation)
Optional TopSafe cover protects against dirt and impact
Optional extension cable and probe handle available
Optional wireless probe connection with up to 20m range (requires one radio module Testo part no. 0554 0188 to be plugged into the instrument and one radio handle Testo part no. 0554 0189 to attach the 625 humidity sensor to)

plug in humidity sensor, instructions and alkaline battery.

Monitor ambient climates indoors with this hygrometer from Testo. The handheld device takes readings of temperature and humidity for enhanced monitoring and control. The screen is backlit for ease of reading in dark areas. You can quickly and easily control the device thanks to a simple four-button design that lets you flip between readings and modify the display. Its type K probe has a broad temperature measurement range of -200°C to +1370°C for use in demanding applications.

• Humidity measurement resolution of 0.1%RH (relative humidity) for precise readings
• Broad operating temperature range of -20°C to +50°C for use in harsh environments
• Durable ABS (acrylonitrile butadiene styrene) housing material for resistance to impact and wear
• Auto-off function to help conserve battery power during periods of inactivity

• Testing facilities
• Sensitive equipment storage
• Industrial spaces
• Botanical greenhouses
• Food manufacturing plants

Yes, this hygrometer is powered by a 9V battery, so it doesn't require access to an external power source. The battery has a long lifespan of up to 70 hours for long-lasting use. Its light weight of 195g also makes it easy to carry.