Shelly Presence Gen4 (S4SN-0U61X)USB-powered multi-zone mmWave presence sensorA good buy for a home without Thread that wants one sensor to split an open-plan room into separate Matter zones.Wi-Fi$84.99No brand hub or Thread router required
SONOFF AirGuard CO₂ SAWF-08PDesktop CO₂, temperature and humidity monitorAirGuard CO₂ is worth considering for a desk where the carbon dioxide reading should stay visible alongside temperature and humidity.Wi-Fi$49.90No brand hub or Thread router required
SONOFF AirGuard PM2.5/PM10 SAWF-07PDesktop particle, temperature and humidity monitorAirGuard PM2.5/PM10 is a useful $39.90 choice when you want a visible particle reading, Wi-Fi and configurable alerts.Wi-Fi$39.90No brand hub or Thread router required
Aqara Presence Multi-Sensor FP300Battery-powered radar/PIR presence and climate sensorThe more compelling Aqara presence sensor for a new room when hiding a power cable is awkward.ThreadFrom $49.99Needs a Thread border router
Sensereo MSC-1 Smoke & COEuropean combination alarm with a local CO displayMSC-1 is worth considering when one European alarm needs to detect both smoke and CO and show a reading without a phone.Thread$69.99Needs a Thread border router
Meross Matter Smart Water Leak Sensor Kit (MS405HMA)Hub-based water-leak sensor kit with dual audible alarmsMS405HMA is worth buying for one remote leak-risk spot because the sensor and hub each sound an alarm, and the kit includes batteries plus a regional power adapter.Matter bridgeFrom $26.99Needs a brand hub
Aqara Climate Sensor W100Indoor temperature/humidity display with three scene buttonsA convincing room display when you will also use its buttons or an existing Aqara thermostat.ThreadFrom $39.99Needs a Thread border router
arre Contact SensorCompact coin-cell door and window sensorA reasonable choice when a compact body and an ordinary CR2032 battery suit the frame.Thread$23.99Needs a Thread border router
Bosch Motion Detector II [+M]Motion SensorAn appealing €49.95 sensor for a passage that benefits from a small built-in light, or a room where the pet filter matters.Thread€49.95Needs a Thread border router
Heiman D1-M Door & Window SensorCompact indoor contact sensor with a replaceable coin cellD1-M earns a look when a long contact sensor would spoil a visible frame or simply not fit.ThreadFrom €29.90Needs a Thread border router
Heiman H1-M Temperature and Humidity SensorCompact room sensor with a temperature and humidity displayH1-M is worth considering for a desk or bedside table where you want both readings visible without tapping a screen.ThreadFrom €29.90Needs a Thread border router
Heiman HS-720ES-M Carbon Monoxide AlarmEuropean CO alarm with replaceable AA batteriesHS-720ES-M is a sensible €39.90 CO alarm for a European Thread home that values connected alerts and ordinary AA batteries.ThreadFrom €39.90Needs a Thread border router