Key Features: Innovative infrared sample temperature measurement. Data logger function with SD card interface. Spring-loaded sealed measurement chamber. Measurement range - 0.11 to 0.90 Aw, with an accuracy of +/- 0.01 Aw. Designed for the determination of the water activity (Aw) in food, cosmetics, and pharmaceutical products. The large LCD with intuitive menu structure displays water activity (Aw), temperature, and stability. The meters uses the latest noncontact infrared sampling technology and a maintenance-free Aw sensor. Use the optional filters to accurately measure samples with critical additives such as alcohol, acids, bases, and chlorine. The unique Aw sensor is designed to be field calibrated after multiple uses. The sensor can also be easily replaced when it is no longer performing to factory specifications it is the sensor which holds all the factory-calibrated values within it, allowing the unit to be within calibration.