Sensirion company introduced SHTxx single-chip digital integrated temperature and humidity sensor. The use of CMOS process micromachining patented technology (CMOSens technology) ensures that the product has extremely high reliability and excellent long-term stability. The product has the advantages of low power consumption, fast response, and strong anti-interference ability. Brand: Sensirion imported from Switzerland Model: SHT30 SHT31 SHT35 DIS Power supply voltage: 2.4~5.5 VDC Measurement accuracy (main difference): SHT30: temperature ¡¾0.3¡É, humidity ¡¾3%RH SHT31: temperature ¡¾0.3¡É, humidity ¡¾2%RH SHT35: temperature ¡¾0.1¡É, humidity ¡¾1.5%RH Working range: -40¡É~125¡É, 0%RH~100%RH Resolution: 0.1¡É, 0.1%RH Communication protocol: standard I2C protocol Cable length: 1 meter (you can contact customer service to extend it) Wiring mode: red-VCC, black-GND, yellow-SCL, green-SAD Features: 1) The circuit board is welded with pull-up resistor and filter capacitor to better protect the chip. 2) All the circuit boards are potted and waterproofed, and there is no need to worry about short circuits caused by water, and they can be used again after drying. 3) This product is IIC communication, each sensor will be tested before shipment, please rest assured to buy 4) Free chip description and source code examples are provided. Note: This product has a certain degree of professionalism, non-professionals please purchase with caution. Model difference: HB68 is suitable for indoor and outdoor (generally waterproof, can be rained) HB76 is suitable for indoor and outdoor (generally waterproof, can be rained) SJ74 is suitable for indoor (not waterproof, high temperature, high sensitivity) HB68 is suitable for indoor and outdoor (completely waterproof, indoor and outdoor, can be soaked in water)