$15 – $25
Zigbee temperature, humidity, and atmospheric pressure sensor with ±0.3°C accuracy. 2-year battery life. Requires Aqara hub.
You need atmospheric pressure readings
Includes barometric pressure sensor (25hPa threshold for instant reporting). Useful for weather monitoring.
You want HomeKit climate automations
Works with Apple HomeKit for temperature-based automations. Control fans, heaters, or humidifiers automatically.
You already have an Aqara hub and ecosystem
Seamless integration with existing Aqara devices. Create automations based on temperature/humidity thresholds.
You want affordable whole-home temperature monitoring
One of the cheapest climate sensors at ~$18. Industrial-grade Sensirion sensor with ±0.3°C temp and ±3% humidity accuracy.
You need to use it in bathrooms or high-humidity areas
Manual explicitly states not for high-humidity environments like bathrooms, basements, or refrigerators.
You need real-time continuous readings
Reports only once per hour if conditions are stable. Instant updates only when temp changes >0.5°C or humidity >6%.
You do not have an Aqara hub
Requires Aqara hub ($30-60 extra). Not compatible with other Zigbee hubs without workarounds.
Sensor can show as connected in Aqara app but not report data to HomeKit. May require re-pairing.
Apple CommunitySensors drop out after battery replacement. May need complete re-pairing to restore functionality.
Home Assistant CommunityHumidity readings 9-16% higher than reference hygrometers in testing. Less accurate than spec suggests.
Ctrl.blog ReviewSome sensors completely stop working after ~2 years even with new batteries. Hardware failure suspected.
GitHub/ForumsHumidity readings significantly higher than actual
commonCause: Sensor calibration issues - readings 9-16% higher than reference devices
Sensor stops reporting data but shows as connected
occasionalCause: Zigbee communication issues or sensor malfunction
Cannot use in bathroom/basement - high humidity limitation
widespreadCause: Hardware design limitation explicitly stated in manual
Infrequent updates when conditions are stable (once per hour)
widespreadCause: Battery-saving design - only updates on significant changes
Complete hardware failure after 2 years of use
occasionalCause: Unknown hardware issue - new battery does not restore function
Installing in bathroom, basement, or refrigerator
Sensor malfunctions or gives inaccurate readings in high humidity
Tip: Only use in normal indoor humidity environments. Manual explicitly warns against high-humidity placement.
Expecting real-time continuous readings
Frustration when readings only update once per hour in stable conditions
Tip: Understand reporting thresholds: temp >0.5°C, humidity >6%, or pressure >25hPa triggers instant update.
Installing on or near metal surfaces
Zigbee signal interference causes dropouts and missed readings
Tip: Keep sensor away from metal. Ensure clear path to Aqara hub within 7-10m.
Remote notifications, Alexa/Google integration, historical data graphs in Aqara app.
Zigbee communication with hub is local. HomeKit automations run locally. Real-time readings available.
Temperature, humidity, pressure readings with timestamps. Battery status.
Simple environmental sensor - no audio/video. Data logged to Aqara cloud if enabled.
Tested with up to 32 devices
Range 7-10m from hub. Updates: instant if temp changes >0.5°C, humidity >6%, or pressure >25hPa. Otherwise hourly. 2-year battery life.
Max 32 child devices per Aqara hub. High humidity environments not supported. Humidity accuracy may be off by 9-16%.
Eve Weather
If: Want outdoor use or Thread/Matter support
SwitchBot Meter Plus
If: Need display on the sensor itself
Aqara Temperature Humidity Sensor T1
If: Want more accurate readings or newer model
You have an Aqara hub and need basic indoor monitoring
Cheapest option for Aqara ecosystem. Good for normal indoor environments. Pressure sensor is a bonus.
You need bathroom or basement humidity monitoring
Explicitly not designed for high humidity. Will malfunction. Use a dedicated bathroom sensor.
You need accurate humidity readings for HVAC control
Humidity readings can be 9-16% off. Get calibrated sensor for critical applications.
You want to monitor multiple rooms cheaply
At $18 each, deploy many sensors affordably. Great for whole-home temperature mapping.
Specs: ±0.3°C temp, ±3% humidity. Real-world testing shows humidity can be 9-16% higher than actual. Temperature more reliable.
Source: Reviews/TestingUses CR2032 coin battery. Lasts up to 2 years under normal usage. Positive side faces up when replacing.
Source: Aqara FAQNo. The manual explicitly states it does not work in high-humidity environments like bathrooms, basements, or refrigerators.
Source: Product ManualUpdates instantly when temp changes >0.5°C, humidity >6%, or pressure >25hPa. In stable conditions, reports once per hour.
Source: Aqara FAQYes, it requires an Aqara Zigbee hub (M1S, M2, E1, etc.). Not compatible with other Zigbee hubs. Hub sold separately.
Source: Aqara FAQ