AQUmi One

A pH and TDS sensor for aquariums — constantly measures water quality and warns you before something goes wrong. Check the readings on the AQUmi DisplayOne screen or remotely in the AQUmi Portal.

Measurement

A pH probe and a TDS probe (conductivity — overall dissolved solids/hardness) measured continuously, with temperature compensation when a temperature probe is connected — so the pH reading stays accurate whatever the time of day or season.

Readings on the AQUmi DisplayOne screen

AQUmi One has no display of its own — instead, enter its IP address in the AQUmi DisplayOne panel and the pH, TDS and temperature readings appear on the DisplayOne screen and in its web panel, with separate, adjustable alarm limits for pH, TDS and temperature.

Integrations

Home Assistant over MQTT with entity auto-discovery (pH, TDS, temperature, IP address, firmware version) — optional, alongside the DisplayOne integration.

Remote viewing in the AQUmi Portal

With no AQUmi DisplayOne nearby, the device can send its readings to the AQUmi Portal by itself — just turn the option on in the device panel; once we approve it, you see it in your account. Alarm limits for pH, TDS and temperature, and the target pH and temperature, are set there remotely, without touching the device; the device can also be restarted from the portal. On the Pro plan the portal sends email or push alerts and reminds you when the recommended time since the last pH probe calibration has passed.

AQUmi Portal: pH, TDS and temperature from AQUmi One and temperature from TempOne, with charts (sample data)

Calibration and security

pH probe calibration and settings changes (WiFi, MQTT) are done in the device's own web panel, protected by an administrator password.

Specifications

MeasurementpH and TDS, with temperature compensation (optional temperature probe)
Viewing dataon AQUmi DisplayOne (on its screen) or in the AQUmi Portal (remotely, in the cloud) — the device has no display of its own
ConnectivityWiFi 2.4 GHz
Power5 V, continuous operation
IntegrationsMQTT / Home Assistant (auto-discovery), optional
Updatesautomatic, over the network (OTA)
Accessits own web panel, changes protected by an administrator password

How you check the readings

AQUmi One has no screen, so choose one of two ways to view it (or both at once). With AQUmi DisplayOne: unlike TempOne, AQUmi One doesn't pair automatically — just enter its IP address in the DisplayOne panel, under "AQUmi One on this network". Without DisplayOne: turn on sending to the AQUmi Portal in the device panel and let us know — once approved, the readings are visible in your portal account, from anywhere. Details in the manual.

FAQ

Does AQUmi One work on its own, without DisplayOne?

Yes — it is a standalone device with its own web panel; it measures and reports independently of DisplayOne. It has no screen, so to see the readings live you need either an AQUmi DisplayOne nearby or the remote AQUmi Portal.

Can I monitor AQUmi One remotely, with no DisplayOne nearby?

Yes — the device can send its readings to the AQUmi Portal in the cloud by itself, independently of DisplayOne. Once you turn sending on, let us know — we approve the device and assign it to your account; from then on live readings and calibration reminders are visible remotely, from anywhere.

Can I set the pH/TDS/temperature alarm limits?

Yes, in two ways — with an AQUmi DisplayOne connected, in the DisplayOne panel; without DisplayOne, remotely in the AQUmi Portal. The defaults are deliberately wide so there are no false alarms before you set them for your tank.

How often should the pH probe be calibrated?

We recommend calibrating the pH probe regularly (from the device's web panel) — how often depends on the probe and the conditions in the aquarium.

Does the device dose or regulate anything automatically?

No — the current version only measures and reports pH and TDS. It does not control dosing or any other equipment.