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DHT 11 temperature and humidity is a sensor unit that is able to generate calibrated digital output signals. It is very reliable and stabile for long periods of operation. It contains a 8 - bit microcontroller internally and responses clear and fast. It is able to measure temperature between 0 and 50 degrees with 2 degrees of error margin, likewise, it is able to measure humidity between 20% RH to 90% RH with 5% RH of error margin.