ZA-3500 humidity sensor: 1.sensor drying protection device 2.self-calibrating of zero point 3. ... full-scale range by single-point method (proprietary technology)l Sensor drying protection device (proprietary technology)l Operation and control by ... point temperature is lower than 0°C, the output of sensor is frost pointTypical precisionsuperior than ±1°CResponse time (Td)When ...