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SKU HI12922 Category

Wireless Soil pH Meter HALO® - HI12922

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The HI12922 HALO is an innovative, application specific pH electrode with Bluetooth® Smart technology that allows the use of a compatible Apple or Android smart device to be used as a pH meter. This electrode is designed for agricultural, hydroponics and greenhouse growers that need to monitor the pH of soil and soiless media in order to optimize plant growth.

• Conic bulb
 Easy penetration into soft solids and semi-solids
• Triple ceramic junction
High flow rate for fast and stable response
in slightly hydrated media
• Refillable
Allows the filling of the reference cell
with electrolyte fill solution
• Built-in temperature sensor
High accuracy temperature compensated measurements

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Conic Bulb

The conical shaped tip design allows for the easy penetration of the sensor into soft solids and semi-solids such as soil and soiless media. Soiless media includes hydroponics growing media including rockwool, coconut coir, and perlite.

Triple Ceramic Junction

The refillable HI12922 has three ceramic junctions in the reference cell. All pH electrodes have a reference junction that provides continuity between the internal reference wire and the sample. Utilizing a triple ceramic junction design allows for a higher flow rate of fill solution which helps provide for a fast and stable response in damp soil and soiless media.


HI12922 is a refillable pH electrode. Fill solution from the inside will diffuse through the ceramic junctions as it is used and while stored in storage solution. Electrolyte fill solution should be added to the probe when the level drops more than 1 cm (1/2”) from the fill hole in order to maintain a good flow rate sustained by having adequate head pressure (optional).

Built-in Temperature Sensor

The HI12922 has a thermistor temperature sensor built into the tip of the pH electrode. A thermistor based temperature sensor provides for a high accuracy temperature while being in the tip of the electrode allows for a rapid temperature compensated measurement.


Reference Cell Typedouble, Ag/AgCl
Junction Type/Flow Rateceramic, triple
Type of Electrolyte3.5M KCl
Body Materialglass
Glass TypeLow Temperature (LT)
Tip / Shapeconic (12 x 12 mm)
Optimum pH Range0 to 12 pH
Temperature Operating Range-5 to 70°C (23 to 158°F)
Body Length/Overall Length120 mm / 195 mm
Temperature Sensorbuilt-in
Connector TypeBluetooth Smart (Bluetooth 4.0), 10 m (33′) range
Battery Type/LifeCR2032 3V lithium ion / approximately 500 hours
Recommended UseSoil
Range-2.000 to 16.000 pH
±800 mV
-20.0 to 120.0 ºC *(will be reduced to actual probe/sensor limits)
Resolution0.1, 0.01, 0.001 pH
1, 0.1 mV
0.1 ºC
Accuracy (@25ºC/77ºF)±0.005 pH
±0.3 mV
Calibration Pointsup to five points with seven standard buffers
Calibration Buffers1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45 pH
Temperature Compensationautomatic from -5.0 to 100.0 ºC / 23.0 to 212.0 ºF *(will be reduced to actual probe/sensor limits)
Compatibility/System RequirementsAndroid: Compatible with most devices equipped with Bluetooth Smart Technology (Bluetooth 4.0) and running Android 4.3 or later. iOS: Compatible with iPad (3rd generation or newer), iPhone (4S or newer), iPod Touch (5th generation or newer)
Download InformationHanna Lab App is available free from the Play Store or App Store
Ordering InformationHI12922 (HALO) is supplied with auger, storage solution, cleaning solution, pH 7.01 buffer solution, pH 4.01 buffer solution, fill solution, battery, quality certificate, and instruction sheet. Smartphone and tablet not included.

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