Horiba LAQUAtwin Compact Meters

Your lab-in-a-pocket. Horiba LAQUAtwin's unique pocket meter integrates the electrode, display and sample container to enable simple, effective on-site testing by direct measurement from a single drop. Guaranteed accurate measurement from only a single drop of sample onto HORIBA's original flat sensor. Horiba LAQUAtwin Pocket Meter product line-up offers easy, quick, and reliable measurement of 8 parameters. Horiba LAQUAtwin meters brings new dimension to your water quality testing.

Horiba LAQUAtwin Compact Meters: Models Available

Horiba LAQUAtwin pH-11 Compact pH Meter, # 3999960122 Horiba LAQUAtwin EC-11 Compact Conductivity Meter, # 3999960125 Horiba LAQUAtwin Salt-11 Compact Salt Meter, # 3999960128 Horiba LAQUAtwin Na-11 Compact Sodium Ion Meter, # 3200689159 Horiba LAQUAtwin ORP-11 Compact Water Quality pH Meter

Horiba LAQUAtwin pH-22 Compact pH Meter, # 3999960123 Horiba LAQUAtwin EC-22 Compact Conductivity Meter, # 3999960126 Horiba LAQUAtwin Salt-22 NaCl Compact Ion Meter, # 3200689158    

Horiba LAQUAtwin pH-33 Compact pH Meter, # 3999960124 Horiba LAQUAtwin EC-33 Compact Conductivity Meter, # 3999960127      



Horiba LAQUAtwin K-11 Compact Potassium Ion Meter, # 3200689160 Horiba LAQUAtwin NO3-11 Compact Nitrate Ion Meter, # 3200689162 Horiba LAQUAtwin Ca-11 Compact Calcium Ion Meter, # 3200689161 Horiba LAQUAtwin iCa-11C Compact Ionized Calcium Ion Meter Horiba LAQUAtwin F-11 Compact Water Quality pH Meter

Horiba LAQUAtwin Compact Meters: 3 STEPS

Easy, three-step measurement

Follow simple, good testing procedures for accurate and dependable results:

  • Calibrate correctly
  • Avoid mixing samples and standards
  • Always keep the sensor clean


  1. Calibrate

Always ensure the sensor is clean before calibrating.

If not, clean thoroughly with water (don’t worry, LAQUAtwin meters are completely waterproof!)

Place some standard solution on the sensor and press the calibration button. Once the smiley face appears indicating that calibration is complete, wash off the standard solution with water and dry with a clean, soft tissue.


  1. Test

LAQUAtwin meters only need a tiny amount of sample - so no beaker is necessary.

Fill the sensor with the sample and when the smiley face appears, the measurement is complete.


  1. Clean

Clean the sensor thoroughly with water ready for the next test. When the sensor is nearing the end of its usable lifetime, it can be replaced;* you don’t need to replace the meter.

  • *Sensors will need to be replaced after approx.
  • *1500 measurements or when calibration cannot be completed. Sensors are sold separately and are easily removed and replaced

lineHoriba LAQUAtwin Compact Meters: 1×6 One meter. Six different methods*1

Only the LAQUAtwin range allows you to be this flexible! Choose the best method according to your sample, your situation and your needs.

*1 B-771 (conductivity) cannot be tested in solids or powders.


  • When you’re in the lab, you can test the sample in a beaker. Ensure the sensor guard sliding cap is open.



  • Use as a scoop to test water, for example from a river.



  • LAQUAtwin meters can measure sample volumes as low as 0.05 mL*2. Place a drop of the sample onto the sensor with a pipette.
    • *2 Using the HORIBA sampling sheet, volumes down to 0.05 mL can be tested (except for conductivity measurements).


Solid samples

  • Foods containing some moisture can be tested by placing a small piece directly onto the sensor.



  • LAQUAtwin meters can also test dry powders.
  • Simply place the powder sample onto the sensor, and drop on your defined volume of pure water.


Paper and textiles

  • To test sheets of paper and textiles, cut up the sample into small pieces and place directly onto the sensor.
  • Drop on your defined volume of pure water.

Horiba LAQUAtwin Compact Meters: Unique Features

Testing has never been easier!

LAQUAtwin meters have been developed using 60 years of HORIBA know-how to give you the highest quality technology that can be used anywhere and at any time. And they’re so simple to use that you won’t need any training!

Horiba LAQUAtwin Compact Meters: One Touch

Calibrate and measure at the touch of a button — the smiley face will tell you when the result can be read.

Hassle-free automatic calibration with a few drops of standard solution reassures you of your measurement accuracy. Two-point calibration is also possible.*1

*1 Except for B-711


LAQUAtwin: the only meters with flat sensor technology.

HORIBA’s highly-sensitive, flat sensor technology opens up new possibilities for sampling and sample types. Only a small amount of sample is required, so you can easily sample in situ without the need for beakers or other labware.
Sensors are easily replaced as required.


Measure even smaller samples with the LAQUAtwin sampling sheet.*2

The sampling sheet allows trace volumes to be analyzed. For example, you can even measure the pH of human skin by wiping with a sampling sheet soaked in pure water, and placing it on the sensor.

*2 Using the HORIBA sampling sheet, volumes down to 0.05 mL can betested (except for conductivity measurements).


Carry case comes as standard for handy portability.

The compact carry case contains everything you need for your measurements, including the standard solution and sampling sheets.

LAQUAtwin is IP67 rated.

The meter and sensor are fully waterproof*3 and dustproof, so you can take it anywhere.

*3 Will withstand immersion for 30 minutes at 1 m. Not suitable for underwater use.

Horiba LAQUAtwin Compact Meters: Technologies

Flat sensor

Employing the same test principle as standard laboratory electrodes, the LAQUAtwin packs all components*1 into a flat sensor that’s less than 1mm thick. Tests liquids in trace volumes, and can also be used for solids, powders, and paper/materials (containing moisture).*2

*1 B-711/712/713 (pH) incorporates a glass membrane and a reference electrode. B-771 (conductivity) incorporates an electrical conductivity cell. Ion meters and the sodium salt meter incorporate an ion membrane and reference electrode.
*2 B-771 (conductivity) does not work with solids, powders or paper/materials.

Horiba LAQUAtwin Compact Meters: Example for Ion Measurement

lineHoriba LAQUAtwin Compact Meters: Videosline