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I have a few of these
https://www.amazon.co.uk/ThermoPro-TP357-Bluetooth-Hygrometer-Thermometer/dp/B093PT1NL1
Temperature is generally within a tenth of a degree of my Thermapen so seems pretty accurate.Humidity seems to be in line with what my dehumidifier says but I don't know how accurate that is.
Plays nicely with Home Assistant if that is of interest to you.
I'm looking to buy a few portable battery-powered ambient temperature and humidity sensors with displays, but don't want to end up with shit ones that are inaccurate.
What should I be looking for?