I have some temperature sensors in my house, Aeotec, Sonoff, Aqara and I use one old little weather station Bresser to set the temperature of these smart sensors, but I don’t know if this is the correct temperature …
In the last few days I tried in internet a thermometer to have one reference temperature but the professional cost so much …
Well, maybe is the old mercury thermometer the most reliable temperature “sensor”?
I thought about this for a long time, but decided in the end it didn’t really matter as long as they all reported the same. So I put them all in one place, and made sure they all reported the same temperature. This way I know that whatever I use them for, they all report identically.
Most of the sensors that are compatible with SmartThings have a variance of +/- 1 degree Celsius. They aren’t intended to be super accurate. And while some (like the Fibaro multi sensor) allow you to calibrate them with an offset, most do not.
There are more accurate sensors available, but as you noted, they do usually cost more.
What country are you in? The device selection does vary.
Yes, they aren’t intended to be super accurate, but a variance of +/- 1 degree Celsius is too much in the temperature measurement …
I live in Italy …
I calibrate all my ST temp sensors to my house thermostats.