The Aualab Pre is a robust entry-level water activity meter with striped down form, not limited function.
It uses the same industry-standard primary aw method you find in the top-of-the-line AquaLab Series 4TE. The Pre may look basic, but that's because all the good stuff is inside.
Specifications
Sensor Types Chilled-mirror dewpoint; Infrared temperature
Accuracy ±0.01 aw
Range 0.05 to 1.000 aw
Sample Dish Capacity 7ml recommended (15ml full)
Resolution Chilled Mirror: ±0.001a w
Measurement Time Less than 5 minutes
Temperature Control 25°C
Sample Temperature Accuracy ±0.2°C
Operating Environment 4 to 50°C (39.2 to 122°F)
0 to 90% Relative Humidity (non-condensing)
Data Interface RS232A Compatible, 8-data bit ASCII code,