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The DHT22 goes by several names. The other common name is the RHT22. The data sheet says that it will run from 3.3V to 6V which makes it ideal for Arduino application. Temperature range is -40°C to 80°C with 0% to 100% relative humidity.
The Si7021 is a low-cost, easy-to-use, highly accurate, digital humidity and temperature sensor. This sensor is ideal for environmental sensing and data logging and perfect for build a weather stations or humidor control system.
This is a stainless steel, Type-K Thermocouple probe. A thermocouple works by taking two wires made of dissimilar metals, connecting them at the two ends, and making a temperature gradient between one end and the other (a ‘hot’ end and a ‘cold’ one).
Sonoff TH16 is a wireless temperature and humidity monitoring switch which can remotely monitor and set temperature and humidity range to turn on/off connected appliances through the iOS/Android APP eWeLink.You can buy your Temperature Sensor Here
This is a Waterproof DS18B20 Temperature Sensor/Thermometer. The probe uses original DS18B20 temperature sensor chip. It is waterproof, moisture-proof and anti-rust with the high-quality stainless steel tube encapsulated. No other components, unique single bus interface.