http://www.aosong.com/en/products-32.html

Official Datasheet (EN): AHT20-AM2108_A4.pdf  

Lib: https://github.com/Thinary/AHT_Sensor

Price: 1.7$


See some test results:

Test 2 v9 new sensors overview

Test 3 v10a high to low humidity

Test 1 v10b humidity absorber

Test 5 v10b NaCl solution draft

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