IKEA TIMMERFLOTTE Temperature/Humidity Sensor

A useful little display before it is a smart sensor

TIMMERFLOTTE makes sense as a room thermometer first. It shows temperature and humidity without requiring a hub, and it costs about £5 in the UK, about €8 in Germany and France, and about $12 in the US. Two AAA batteries are extra. You can put it beside a bed or in a utility room without routing a power cable to the shelf.

That is an appealingly small commitment for a basic question: is this room warmer or more humid than you expected? It does not need to become a heating-control project to earn its place.

IKEA sells the same sensor under three article numbers: 506.189.57 in the US and Canada, 606.189.52 in the UK and several EU countries including Ireland, Italy and Poland, and 305.976.06 in Germany, France, the Netherlands, Spain and the Nordic countries. Buy whichever one your local IKEA lists.

The fading screen determines where it belongs

The display fades while idle and returns when you tap it, showing temperature followed by humidity. That suits a spot within reach, but makes it much less useful high on a shelf or across a room.

If you want a number that is always visible from your chair, look at a sensor built around its screen. Aqara Climate Sensor W100 keeps a 3.4-inch LCD in view and adds three scene buttons, for more than three times TIMMERFLOTTE's US price. In Europe, Heiman H1-M shows both readings at once in a smaller body, but it also costs several times as much and runs on a CR2450 coin cell that Heiman rates at about six and a half months.

Battery power is the benefit on the other side of TIMMERFLOTTE's compromise. There is no visible USB cable, and the AAA format is straightforward to replace. The batteries being excluded is a small but unnecessary extra at checkout: IKEA recommends its rechargeable LADDA AAA cells, and a four-pack (about £4, €5 or $10) covers only two sensors.

Connect it when a history would help

With suitable Matter and Thread hardware, the measurements can feed a connected history or threshold rule. Home Assistant and SmartThings support temperature and humidity readings. That adds value when you want to see overnight changes rather than a single number at the moment you tap the screen.

It does not automatically replace the temperature sensor used by a thermostat. Buy it for room monitoring unless your actual heating system supports the control arrangement you need. For CO₂ or particles, ALPSTUGA measures those different things and uses USB power.

TIMMERFLOTTE is an inexpensive indoor choice within its 0–40°C range. For an exposed balcony or outdoor temperature and humidity, the Matter version of Eve Weather has an outdoor-rated design. Choose TIMMERFLOTTE when a reachable, battery-powered room display is the job; its disappearing numbers are the reason to skip it for a distant glance.