Sensirion™ makes & sells a stand-alone "development kit" module 'SMART GADGET' for their SHT31 chips. Try contacting them to see about getting one:
https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/2_Humidity_Sensors/Sensirion_Humidity_Sensors_SHT3x_Smart-Gadget_User-Guide.pdf
One of our forum members here has a couple of them that he is comparison testing. The SHT31 is the same sensor chip that's used in current Davis VP2 weather stations.
I have a wineador for cigars. I bought three different hygrometers to monitor the humidity. One could not be calibrated, it was "Good out of the box"... not.
One could only be adjusted by 6%. I did the salt test, left it in a sealed freezer bag, at room temperature, with a salt / water solution for 12 hours, found it wasn't within 6%.
The third could be adjusted for any amount. I did the salt test and calibrated it. After a week, my humidity level did not drop below 70%. I was suspicious, so I ordered the one quoted above, to compare with what I had in the wineador. Since this one is the same sensor I put in my VP2, I have high hopes.
I selected US Mail, but they shipped it Priority Mail, and I received it today. I will do the salt test later, see what I come up with. For now, I'll monitor it, see what I get.
Since it has blue-tooth, I installed the app for IOS. The app would be great, if the sensor is accurate. If not, It isn't the first bad hygrometer that I bought.