The secret to the 4TE’s speed and accuracy is rein its unique chilled mirror dew point sensor. The dew point sensor is a primary measure of water activity. Unlike other water activity sensors, the dew point Messwertgeber measures water activity (aw) directly, not secondary parameters correlated with water activity. Microsoft https://thoughtsonlearning.com/why-peak-playgrounds-should-be-your-first-choice-for-playground-equipment/