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Humidity Sensors
This breakout has a typical accuracy of 0.5% for the RH sensor and an accuracy of ±0.1°C for the temperature sensor.
This BME280 sensor from Bosch has an environmental sensor with temperature, barometric pressure and humidity!
The AHT20 is a nice but inexpensive temperature and humidity sensor from the same folks that brought us the DHT22.
The SHT45 sensor is Sensirion's fourth-generation temperature and humidity sensor with outstanding accuracy.
The SHT41 sensor is the fourth generation of I2C temperature and humidity sensor from Sensirion.
A true carbon dioxide sensor that can detect CO2 levels between 400 and 5,000 ppm, mounted on a Breakout Garden and Qw/ST-compatible breakout.
The soil moisture sensor consists of two probes that allow the current to pass through the soil and then obtain resistance values to measure soil moisture content.
A really nice environmental sensor that's ideal for indoor monitoring of temperature, pressure, and humidity
The SparkFun Soil Moisture Sensor is a simple breakout for measuring the moisture in soil and similar materials.