Here is another tiny E-ink gadget that can give you temperature and humidity readings. This ZigBee Digital Thermometer & Hygrometer is powered by a CC2530 chip and has an open source software. It uses an E-ink display (GDEW0102T4) from Good Display.
More gadgets like this: here
This thermometer and hygrometer has a 3D printed case. It has magnets inside, so you can attach it to metallic surfaces.
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