The Water Activity mainly reflects the amount of free water in the state of food balance, the stability of food and the possibility of microbial reproduction, and the chemical, enzyme and physical changes that can cause the change of food quality. This meter is calibrated by factory,nbsp;usersdonbsp;notnbsp;neednbsp;tonbsp;calibrate again, just input samples and testwhich is very simple.nbsp;1. Sensor: Non conductive humidity sensor(stainless steel sensor)2. Range: 0~1.0aw3. Resolution: ��0.01aw4. Accuracy: ��0.02aw5. Display: 6 bit backlight LCD digital display (3 bit humidity aw, 3 bit temperature display)6. Sampling Time: 5 Minutes7. Operation Conditions: Temperature:0~50oC; Humidity: