HORIBA LAQUAtwin

HORIBA LAQUAtwin Pocket Water Quality Meters

A LAQUAtwin meter is a pocket-sized, IP67 waterproof water quality meter that integrates the electrode, digital display and sample container into a single handheld unit. Instead of dipping a probe into a beaker, you place a single drop — as little as 0.12ml — directly onto a flat sensor chip and read the result in seconds. HORIBA's LAQUAtwin range covers 10 water quality parameters across 15 individual meters and 3 ready-made kits, for pH, ORP, conductivity, TDS, salinity, and the sodium, potassium, calcium, nitrate and fluoride ions.

• pH
• ORP
• Conductivity (EC)
• TDS
• Salinity
• Sodium (Na+)
• Potassium (K+)
• Calcium (Ca2+)
• Nitrate (NO3-)
• Fluoride (F-)

How a LAQUAtwin Meter Works

Every LAQUAtwin meter shares the same core design: a replaceable flat sensor, an IP67 waterproof/dustproof body, and a simple 3-button interface for measuring, calibrating and powering the meter. The layout below is illustrated on the pH model, but the sensor, sensor guard, backlight and button placement are the same across the whole LAQUAtwin range.

7 Ways to Take a Sample

One meter, seven sampling techniques. Use whichever method suits the sample you're working with: immersion in a beaker, a scoop from a river, drops from a dropper, a wipe from a surface, or direct contact for solid, powder, paper, textile or film samples.

How to Choose the Right LAQUAtwin Meter

Every LAQUAtwin meter is built around one parameter, so the fastest way to find the right model is to start with what you need to measure, then narrow down by calibration accuracy or sample type.

Measuring pH

Choose PH-11 for straightforward 2-point calibration, PH-22 for tighter 3-point calibration, or PH-33 if you also need a temperature reading alongside pH with 5-point calibration.

PH-11 · PH-22 · PH-33

Measuring conductivity or TDS

Choose 4EC-11 for conductivity only, 4EC-22 for conductivity plus temperature, or 4EC-33 if you also need total dissolved solids alongside conductivity and temperature.

4EC-11 · 4EC-22 · 4EC-33

Measuring salinity

Choose SALT-22 for a direct sodium-ion-based salinity reading, or 4ECSalt-11 if you prefer a conductivity-based salinity reading converted to NaCl concentration.

SALT-22 · 4ECSalt-11

Measuring redox potential

Choose ORP-11 for on-site oxidation-reduction potential (mV) testing from a single drop, at a constant sample temperature.

ORP-11

Testing a specific nutrient or mineral ion

Choose the dedicated ion meter for sodium (NA-11), potassium (K-11), calcium (CA-11) or nitrate (NO3-11) — each reads viscous liquids, solids and powders, not just free liquids.

NA-11 · K-11 · CA-11 · NO3-11 · F-11

Building a multi-parameter field kit

Choose the 4M Kit if you need several ion meters in one configurable carry-case, or a dedicated NO3-11C crop kit or NO3-11S soil kit if nitrate testing is your primary in-field task.

4M Kit · NO3-11C · NO3-11S

LAQUAtwin Model Comparison

Side-by-side specifications for every current LAQUAtwin meter, to help you compare calibration accuracy, sample volume and typical use before you buy.

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Model	Parameter Measured	Min. Sample Volume	Calibration Points	Best Suited For
PH-11	pH	0.1ml (0.05ml with sheet B)	2-point	General field and lab pH checks
PH-22	pH	0.1ml (0.05ml with sheet B)	3-point	Higher-accuracy pH work
PH-33	pH & temperature	0.1ml (0.05ml with sheet B)	5-point	pH work needing a temperature reading
ORP-11	ORP (redox, mV)	0.3ml (0.05ml with sheet B)	1-point	On-site oxidation-reduction testing
4EC-11	Conductivity	0.12ml	3-point	Nutrient/salinity screening via EC
4EC-22	Conductivity & temperature	0.12ml	3-point	EC work needing a temperature reading
4EC-33	Conductivity, TDS & temperature	0.12ml	3-point	Full EC/TDS/temperature profile
4ECSalt-11	Salinity (via conductivity)	0.12ml	2-point	Quick conductivity-based salt readings
SALT-22	Salinity (via Na+ sensor)	0.3ml	2-point	Direct sodium-ion-based salt readings
NA-11	Sodium ion (Na+)	0.3ml	2-point	Sodium in food, plant sap and sweat
K-11	Potassium ion (K+)	0.3ml	2-point	Potassium in soil and plant tissue
CA-11	Calcium ion (Ca2+)	0.3ml	2-point	Calcium in soil, plant sap and food
CA-11C	Ionized calcium (bovine blood)	0.3ml	2-point	Cow-side dairy herd health screening
NO3-11	Nitrate ion (NO3-)	0.3ml (0.05ml with sheet B)	2-point	Nitrate in soil, crop sap and water
F-11	Fluoride ion (F-)	0.3ml (0.1ml with sheet B)	2-point	Fluoride in liquids, solids and powders

LAQUAtwin pH meters give a fast, reliable pH reading from plant tissue, water or any liquid sample, helping you keep crops within their optimal pH range and catch problems before they affect yield.

The LAQUAtwin ORP-11 integrates the electrode, display and sample container to enable simple, effective on-site oxidation-reduction potential testing from a single drop. ORP is measured with a noble metal electrode (gold or platinum) alongside a reference electrode, and is temperature-sensitive, so readings should be taken at a constant sample temperature.

The 4EC series is HORIBA's current-generation LAQUAtwin conductivity range, replacing the earlier EC-11, EC-22 and EC-33. It accurately measures electrical conductivity (EC) — a direct indicator of dissolved salts and nutrient concentration — from a 0.12ml sample, with a third low-range calibration standard added for better accuracy across the full measurement range.

Conductivity (or EC) is the measure of total dissolved salts in a solution — a key factor in a plant's ability to absorb water. In horticultural applications, monitoring salinity helps manage the effect of soluble salts on plant growth, making EC and Na+-based salt readings a meaningful indicator of water quality, soil salinity and fertilizer concentration.

These pocket ion meters directly measure sodium, potassium or calcium ion concentration in a sample as small as 0.3ml. A unique sensor allows measurement of viscous liquids, solids and even powder samples, with no beaker needed to calibrate the meter or measure a sample — useful for plant sap, food testing and soil sampling.

The nitrate meter directly measures nitrate ion and nitrate-nitrogen concentration from as little as 0.05ml with sampling sheet B, making it fast enough for rapid in-field crop and soil testing. The fluoride meter directly measures fluoride ion concentration with the same single-drop, no-beaker workflow.

Pre-configured carry-case kits for teams that need several parameters covered in one field-ready package, or that focus specifically on nitrate testing in crops or soil.

Applications

LAQUAtwin meters are used wherever a fast, accurate reading is needed from a tiny sample — in the field, in a processing line, or on the bench — without the time cost of sending samples to a lab.

Agriculture & Horticulture

Growers use LAQUAtwin meters to check pH and conductivity in coconut coir substrate, determine nutrient concentration in soil solution and tomato plant sap, measure pH directly in plant tissue, and track soil nitrate for plant-available nitrogen — catching nutrient deficiencies before they show up as reduced yield.

Soil & Irrigation Salinity

Because conductivity reflects total dissolved salts, LAQUAtwin EC and salt meters are used to measure soil salinity in almond orchards, assess the impact of salinity on sugar cane yield, and monitor irrigation water quality on farms where soil salinisation is a yield risk.

Food & Beverage Testing

Food producers use pH measurement to check the acidification of fermented sausages, the freshness of meat products, the acidification of sushi rice, and the pickling of fruits and vegetables, plus sodium and calcium ion checks in canned foods, milk and milk beverages.

Dairy & Veterinary Health

The CA-11C ionized calcium meter is used cow-side to screen dairy herds for subclinical hypocalcemia (milk fever) at the onset of lactation, giving veterinarians and producers a same-visit result instead of waiting on a lab blood test.

Industrial & Process Water

LAQUAtwin meters check residual sodium during clean-in-place processes, monitor pH of cement for floor installation testing, and support quick pH and conductivity checks in general water quality and boiler feed water monitoring.

Conservation & Arts

Conservators use pH and conductivity readings to test acrylic paint films and paper supports, and to formulate isotonic aqueous cleaning solutions that match a work's own pH and conductivity — reducing dirt, mould and stain removal risk on sensitive materials.

Sourcing LAQUAtwin Meters in South Africa

Ecotao stocks the current HORIBA LAQUAtwin range locally, including the 4EC and 4ECSalt models that replace the earlier EC and SALT-11 meters most South African labs and farms were originally sold. If you're replacing a discontinued EC-11, EC-22, EC-33 or SALT-11 unit, or a broken sensor on an existing meter, the 4-series models above are the direct drop-in successors — same sample volume and form factor, with an added low-range calibration standard for better accuracy. Local stock means shorter lead times than ordering direct from HORIBA internationally, and replacement sensors are available without needing to return the full mete