SwitchBot
SwitchBot Meter Pro CO2
- Works with HA
- Local control
- Bluetooth
Prices verified September 2026
See more sensors picks on our Amazon storefront →Our verdict
The affordable route to CO2 monitoring: a genuine NDIR sensor (Sensirion SCD40) plus temperature and humidity on a big desk display for around £60 — half the price of an Aranet4. Reviewers cross-checking it against calibrated meters report readings within about 5%, respectable for this price. The catch is Bluetooth: it only talks to whatever's nearby, so anywhere outside your HA host's BLE range needs an ESPHome proxy or USB Bluetooth adapter in the same room. Best sited in a bedroom or home office, where stale air affects sleep and focus — keep it on a desk away from doors and vents, not a draught. No SwitchBot hub required.
What can Home Assistant control on the SwitchBot Meter Pro CO2?
| Control | Type | What it does |
|---|---|---|
| CO2 | Sensor (ppm) | NDIR carbon dioxide reading |
| Temperature / Humidity | Sensor | Room conditions |
| Sync time | Button | Correct the onboard display's clock |
A confirmed HA bug had this specific model misidentified as a completely different SwitchBot product (a light strip), creating a light entity instead of sensors until fixed — worth an integration reload if readings don't appear after pairing. Because it's read over BLE, having the SwitchBot app open on a phone at the same time as HA's connection can cause timeouts from competing connections. There's also a sync-clock button entity worth automating on a daily schedule to keep the onboard display's time accurate through DST changes, something manual in the SwitchBot app otherwise.
Specs
| power | 2x AA batteries (pre-installed, ~1 year) or USB-C |
|---|---|
| display | LCD, no backlight, large digits with comfort indicator |
| requires | HA Bluetooth adapter or ESPHome Bluetooth proxy in range |
| co2 range | 400-9999 ppm |
| dimensions | 92 x 79 x 25 mm, 154g |
| sensor type | CO2 (NDIR, Sensirion SCD40), temperature, humidity |
| co2 accuracy | ±(50 ppm + 5% of reading) |
| temp humidity accuracy | ±0.2°C (0-65°C); ±2% RH (10-90%) |
How does the SwitchBot Meter Pro CO2 compare?
| Product | From | Protocol | Local control | Integration |
|---|---|---|---|---|
| SwitchBot Meter Pro CO2 (this product) | £59.99 | Bluetooth | Yes | Works with HA |
| Aqara Door and Window Sensor P2 | £23.99 | Matter, Thread | Yes | Works with HA |
| Aqara Motion Sensor P1 | £18.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Aqara Multi-State Sensor P100 | £25.49 | Zigbee, Thread, Matter | Yes | Zigbee2MQTT / ZHA |
Frequently asked questions
- Does the SwitchBot Meter Pro CO2 work with Home Assistant locally?
- Yes. The SwitchBot Meter Pro CO2 is controlled locally in Home Assistant through a certified "Works with Home Assistant" integration (switchbot), so it keeps working if your internet connection or the SwitchBot cloud goes down. Control and state updates stay on your own network.
- Which protocol does the SwitchBot Meter Pro CO2 use, and do I need a hub?
- The SwitchBot Meter Pro CO2 uses Bluetooth. To pair it with Home Assistant you need a Bluetooth adapter on your Home Assistant host or an ESPHome Bluetooth proxy. SwitchBot's own hub is not required when you integrate through a certified "Works with Home Assistant" integration (switchbot).
- How much does the SwitchBot Meter Pro CO2 cost in the UK?
- The lowest price we have listed for the SwitchBot Meter Pro CO2 is £59.99 at Amazon UK, with other UK retailers at up to £59.99. Prices were last checked in September 2026 and change often, so confirm on the retailer's page before buying.