Soil Temperature Humidity Sensor Probe Digital Waterproof Soil Moisture Tester Probe I2C Interface Output DC3.3V Item Type: Soil Temperature Humidity Sensor Material: 304 stainless steel Plastic Model: FS304 SHT45 Operating Current: <10mA Humidity Accuracy: ±1.5%RH Temperature Accuracy: ±0.1°C Operating Voltage: 3.3V Temperature Measurement Range: -20℃ to 100℃ Humidity Measurement Range: 0 to 100%RH Communication Interface: I²C Operating Condition: - 40°C to 125°C, 0 to 99%RH Storage condition: - 20℃ to 80℃, 0 to 95%RH Housing: 304 stainless steel IP67 waterproof Cable Length: Approx.150cm / 59.06in  Caution Air relative humidity is a function of temperature, air temperature has a great impact on relative humidity, acids, bases, salts and other compounds have a significant impact on the physical properties of water vapour, the following matters should be noted when using: 1. The temperature and humidity sensor should be installed in a place where the temperature is relatively stable and best represents the measured ambient temperature and humidity. 2. Avoid installation in places where the temperature changes drastically. 3. Avoid installation in places with intense air flow. 4. Avoid installation in dead ends where the air does not flow. 5. Avoid using in salt spray environment. Avoid using in corrosive gas environment. Operating conditions The sensor performs normally within the recommended operating range, see Figure 1. prolonged exposure to conditions outside the normal range, especially at humidity > 80%, may result in a temporary drift of the signal (drift of 3% RH after 60 hours). Upon return to normal operating conditions, the sensor will slowly self-revert to the corrected state. Prolonged use under abnormal conditions will accelerate the ageing of the product.