Aranet4 HOME vs PRO: Logging, Bluetooth and Which Model to Buy

Buy Aranet4 HOME for a standalone CO2 monitor you read on its screen or sync to a nearby phone. Choose Aranet4 PRO when you need its additional radio link to an Aranet base station for central collection and optional cloud access. Both publish the same typical CO2 accuracy, so choose around how you will collect the readings. HOME datasheet, PRO datasheet.

Quick picks

• A bedroom, home office or portable monitor: HOME; no base station needed.
• Several rooms collected centrally: PRO sensors plus a compatible base station. Owning several monitors alone does not require PRO; the shared manual also documents Bluetooth access to multiple Aranet4s.
• Wi-Fi plus particles or radon: consider Airthings View Plus. For an open-source, externally powered format, consider AirGradient ONE.

HOME vs PRO comparison

Documentation checked November 2, 2026. Sensor specifications: both datasheets, version 3.6, August 28, 2026.

Accuracy applies from 0–5,000 ppm, at 15–35°C and 0–80% RH, within typical limits at equilibrium when sold. Pressure readings are accessed in the app. Shared manual, current app features.

How the monitor, phone, base station and cloud connect

Bluetooth sync needs a nearby phone; the app works without Wi-Fi or mobile data. PRO's separate radio sends measurements to the base station. The base has its own local history and browser interface; optional Aranet Cloud adds centralized remote access through the base's Internet connection. App connection requirements, base features, cloud requirements.

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01Where do you need the readings?+

Choose nearby Bluetooth access or central collection.

• Nearby → HOME ↔ nearby phone
• Central collection → PRO → compatible base station

Sources: 1: Both Aranet4 models support Bluetooth app access., 2: PRO adds a Sub-GHz radio link to the base station.

02HOME ↔ nearby phone+

Bluetooth connects the monitor to the Aranet Home app.

Outcome

Sources: 1: Both Aranet4 models support Bluetooth app access.

03PRO → compatible base station+

PRO retains Bluetooth and adds a regional radio to the base.

• Local access → Base → local browser
• Remote cloud access → Base → Internet → Aranet Cloud

Sources: 1: Both Aranet4 models support Bluetooth app access., 2: PRO adds a Sub-GHz radio link to the base station.

04Base → local browser+

Open the base's web interface on its local network.

Outcome

Sources: 3: The base web interface is accessed on its local network.

05Base → Internet → Aranet Cloud+

Optional cloud service provides centralized remote access; the base needs Internet.

Outcome

Sources: 4: Aranet Cloud provides centralized remote access., 5: Connecting the base to Aranet Cloud requires Internet.

Source notes5 references+

1. 1

   Both Aranet4 models support Bluetooth app access.

   assets.aranet.com ↗ — source for Both Aranet4 models support Bluetooth app access.

   Download the Aranet4 app and connect via Bluetooth with up to six devices.

2. 2

   PRO adds a Sub-GHz radio link to the base station.

   assets.aranet.com ↗ — source for PRO adds a Sub-GHz radio link to the base station.

   includes Aranet Sub-GHz ISM band radio which wirelessly transmits sensor measurements to the Aranet PRO base station.

3. 3

   The base web interface is accessed on its local network.

   help.aranet.com ↗ — source for The base web interface is accessed on its local network.

   To connect to the WebGUI of the base station, you need to connect to the local network of the base station.

4. 4

   Aranet Cloud provides centralized remote access.

   help.aranet.com ↗ — source for Aranet Cloud provides centralized remote access.

   enable centralized and remote data access for any number of sensors and bases.

5. 5

   Connecting the base to Aranet Cloud requires Internet.

   help.aranet.com ↗ — source for Connecting the base to Aranet Cloud requires Internet.

   **Aranet base must be connected to Internet!**

Extended Bluetooth range reduces expected battery life. Already run Home Assistant? Check Aranet's documented nearby integration before specifying a PRO system. Integration instructions.

Best standalone: Aranet4 HOME

HOME's e-ink screen shows CO2, temperature and humidity; the app adds pressure, graphs, settings and firmware updates. Its optional buzzer is disabled by default. Display and app, default settings.

The monitor keeps measuring while your phone is away; the app retrieves available history when you return. Choose HOME if that collection routine fits. Independent measurement.

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Best for central collection: Aranet4 PRO

Our PRO configuration is the TDSPC0U3 sensor on US920 for US installations. The PRO datasheet lists two AA alkaline batteries and a configuration pin in the package; specify the matching regional base separately. PRO specification and package.

A naming trap: the older HOME/PRO leaflet names the Aranet PRO base station; current help marks that original base discontinued. For new installations, investigate PRO Plus. The current base comparison lists all-Aranet sensor support, local history and 12 sensors by default, with license upgrades to 50 or 100. Original base status, current base comparison.

Base-station graphs export CSV and XLSX locally. Cloud data access needs a separate Basic or Pro subscription after the trial. Confirm capacity, integration licenses, power equipment and cloud requirements in the system quote. Base export, cloud licensing.

View Aranet4 PRO specifications · PRO Plus setup documentation

Logging and export: sensor memory is separate from app history

Both current datasheets give this retention table:

The app's 90-day history is data synchronized to the phone. It cannot recover sensor readings already overwritten. At the default interval, reconnect before the 15-day buffer expires; at one-minute intervals, plan around 3.5 days. Enable Background data read to sync while within range, subject to the app running in the background. Storage behavior.

To export, open the graph, use the share control, select a date range and choose CSV or XLSX. Export regularly for a longer archive: the app also overwrites older history. Changing the measurement interval restructures existing sensor history by averaging or padding values, so avoid switching intervals during a comparison. Export controls, memory restructuring.

Before replacing batteries, synchronize first: removing them erases the history stored inside the sensor. Keep side vents clear and place the monitor near breathing height, away from direct breath, windows, doors and sunlight. Battery-change warning, placement.

1. 1

   Choose an interval

   Longer intervals retain more days inside the monitor; keep the interval steady during comparisons.

2. 2

   Synchronize before history rolls over

   Background data read works within Bluetooth range while the app runs in the background.

3. 3

   Export and preserve

   Save CSV or XLSX for a longer archive; synchronize before taking out the batteries.

Batteries and calibration

Both use two AA batteries. Both models' tables estimate 2.8 years on alkaline batteries at 20°C, with Bluetooth on and 5-minute intervals. These are extrapolations; Bluetooth activity affects life. HOME battery table, PRO battery table.

Aranet4 arrives factory-calibrated; automatic calibration is off by default. Aranet recommends yearly calibration and says automatic mode needs approximately 8 hours in fresh air around 420 ppm during each 30-day period. If your intended location cannot meet that condition, our recommendation is to retain manual mode and follow the app's calibration guidance. For manual calibration, Aranet specifies a stable fresh-air environment for 30 minutes, staying at least 1 meter away. Calibration FAQ, defaults.

Buying checklist: model, region and bundle

HOME's global part number is TDSPC0H3. PRO has regional versions:

The PRO datasheet also lists TDSPC0U3 under AS923 for specified Asian markets. The part number alone therefore does not settle the radio variant: confirm the band, intended country and compatible base together. For bundles, get an itemized list of sensors, receiver, power equipment and licenses before ordering. HOME identity, PRO region table.

Alternative for Wi-Fi and more sensors: Airthings View Plus

View Plus is worth considering if you want one Wi-Fi monitor with CO2, PM2.5, radon, VOC, temperature, humidity and pressure measurements. It connects over 2.4 GHz Wi-Fi and runs from six AA batteries or USB power, so an Aranet base station is unnecessary for that format. Official View Plus product sheet.

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AirGradient ONE is the alternative for an open-source, externally powered installation. It combines NDIR CO2 with particles, VOC/NOx indices, temperature and humidity, connects over Wi-Fi, and requires a USB power supply. Choose that format if data integration and particle measurements matter more to you than battery portability. Official AirGradient ONE specifications.

What a CO2 reading tells you

Use CO2 trends as a ventilation clue in an occupied room. HSE cautions that single readings can mislead and measurements are only a broad guide to ventilation. Aranet4's listed sensors do not include particles, VOCs or radon, so its CO2 indicator cannot summarize those measurements. HSE guidance.

For humidity-focused shopping, use our hygrometer guide. For particle-filtering appliances, see our air purifier guide; HSE notes that air cleaners do not remove CO2 or improve ventilation.

How we choose

We compare official datasheets, manuals and current support documentation, distinguishing sensor memory, app history and network collection. Picks reflect published capabilities, regional compatibility and licensing; we have no first-hand measurement results. See How we choose.

Verdict

HOME is the pick for most standalone buyers. Choose PRO for its receiver connection after specifying a compatible base and deciding whether you need cloud data access. If your priority is Wi-Fi and additional pollutants, compare View Plus or AirGradient ONE before committing to the Aranet system.