The attractive and compact testo 608 thermal hygrometer is for continuous indoor climate monitoring (humidity, temperature, dew point). The LCD display is legible at distance. The testo 608 models have a max/min value display and a battery monitor. Suspension and standing fixtures allow flexible positioning on a table or wall. Version 608-H2 is the higher accuracy model which also comes with a precise alarm. The 608-H2 alarm reports if humidity and temperature limits are exceeded in building developments and installations ranging from garden centres to museums, storerooms, laboratories and cleanrooms.

With dew point calculation and max/min 2 line LCD display
NTC probe
Humidity sensor not affected by water
Standalone or attachable
Powered by 9 V PP3 battery (supplied)
Testo 608-H2, with LED alarm, warns if limits are exceeded
Housing material ABS
Dimensions 111 x 90 x 40 mm
Weight 168 g

Accurately measure relative air humidity, temperature and dewpoint with this digital hygrometer from Testo. The device has a large liquid-crystal display (LCD) screen to show measured values clearly, and an LED (light-emitting diode) alarm signal alerts you to conditions that require immediate attention so you can react quickly. It's powered by a 9V battery that has a one-year lifespan, so you can use it for a long time before you need to replace the battery. This also means it's portable and simple to use as it doesn't need to be connected to an external power source.

• Quick measuring rate of 18 seconds for accurate real-time measurements
• Light weight of 168g for ease of handling and transportation
• Acrylonitrile butadiene styrene (ABS) housing for durability and impact resistance
• Wide operating temperature range of -10°C to +70°C for use in demanding environments

• Chemical laboratories
• Storerooms
• Cleanrooms

A hygrometer measures condensation by passing a current between two plates to test capacitance, which is the ability of an item to retain an electrical charge. As the presence of water increases, the capacitance also increases, allowing the hygrometer to gauge the moisture level.