Wireless Soil pH Meter HALO® - HI12922

In stock

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

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 Type double, Ag/AgCl
Junction Type/Flow Rate ceramic, triple
Type of Electrolyte 3.5M KCl
Body Material glass
Glass Type Low Temperature (LT)
Tip / Shape conic (12 x 12 mm)
Optimum pH Range 0 to 12 pH
Temperature Operating Range -5 to 70°C (23 to 158°F)
Body Length/Overall Length 120 mm / 195 mm
Temperature Sensor built-in
Connector Type Bluetooth Smart (Bluetooth 4.0), 10 m (33') range
Battery Type/Life CR2032 3V lithium ion / approximately 500 hours
Amplifier yes
Recommended Use Soil
Range -2.000 to 16.000 pH ±800 mV -20.0 to 120.0 ºC *(will be reduced to actual probe/sensor limits)
Resolution 0.1, 0.01, 0.001 pH 1, 0.1 mV 0.1 ºC
Accuracy (@25ºC/77ºF) ±0.005 pH ±0.3 mV
Calibration Points up to five points with seven standard buffers
Calibration Buffers 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45 pH
Temperature Compensation automatic from -5.0 to 100.0 ºC / 23.0 to 212.0 ºF *(will be reduced to actual probe/sensor limits)
Compatibility/System Requirements Android: 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 Information Hanna Lab App is available free from the Play Store or App Store
Ordering Information HI12922 (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.