
Eve Systems has been offering HomeKit-connected devices since 2015, and the Eve Room, able to measure temperature, humidity, and air quality, is the newest Eve product available for purchase.
The new Eve Room is actually an upgraded version of an original Eve Room that was one of Eve's first product releases back in 2015, but the new version has been overhauled with a redesigned enclosure that's both sleeker and more informative.

While the original Eve Room was just a little white plastic block, the Eve Room adopts the new aluminum and e-ink design that was first introduced with the Eve Degree, Eve's more affordable temperature and humidity monitor that does not offer air quality monitoring.

Eve Room (left) next to Eve Degree
Like the Eve Degree, the Eve Room is palm sized and tiny enough that it's unobtrusive on a shelf, on a table, on a kitchen counter, or on a bedside table. It measures in at 2.1 x 2.1 x 0.6 inches, which is quite a bit smaller than the 3.1 x 3.1 x 1.3 inch measurements of the original Eve Room. Eve Room is an indoor product and should not be used outdoors.

The 200x200 e-ink display of the Eve Room displays the current temperature, humidity, and air quality in the room, with air quality pictured as a series of stars from one to five. If you press on the arrows next to the display, you can cycle through several display options that focus on temperature, humidity, or both.
I like the addition of the e-ink screen in the Eve Room because I can check the room conditions at a glance without needing to open up an app or ask Siri, something that was necessary with the previous version of the Eve Room. You do need a little bit of force to change the display output, but it's nice having the option to focus on the parameter most important to you.
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Article Link: Review: The HomeKit-Connected Eve Room Keeps Track of Temperature, Humidity and Air Quality in Your Home