Horiba LAQUA WQ-330-K 3-Channel Handheld Water Quality Meter

WQ-330-K is the three-channel meter of the LAQUA WQ-300 smart handheld series. It runs up to three digital sensors at once, such as pH, conductivity and dissolved oxygen, on a 3.5-inch colour display, stores 10,000 records and can move data over USB or a wireless SD card.

One handheld for a multi-parameter water survey

The WQ-300 concept is a meter body plus snap-on sensors. A pH, EC, ion or ORP sensor head (or a DO sensor) plugs into a push-pull connector, and the meter recognises it automatically. Because the three channels share one display, a user can read pH, conductivity and oxygen side by side, with calibration status shown per sensor, instead of juggling three meters. The WQ-330-K is the bare-meter kit; the sensors are chosen separately, which the product page describes as up to 35 meter-and-sensor kit combinations.

Sensor condition is part of the display. For a pH head the manual grades average slope (95.0 to 105.0 % excellent, 85.0 to 94.9 % very good, 80.0 to 84.9 % good), for an EC head the average cell constant, and for a DO sensor the membrane condition, which also tells you when to change the cap. An LED on the sensor lights as a stability indicator, so you can read it without looking at the screen.

Meter features from the product page and manual

• Triple channel; up to 3 simultaneous calibrations and measurements; automatic sensor recognition.
• 10,000 records with date and time; sample ID setting; auto or manual data log; USB or wireless transfer.
• Auto stable, auto hold and real-time modes; calibration alarm up to 400 days; auto power off up to 60 minutes.
• Seven display languages: English, Japanese, French, German, Spanish, Portuguese, Chinese.
• Accepts BNC electrodes (ion-selective, ORP) through the optional 300-BNC conversion connector.

Technical specification

Meter specification

Sensor data from the manual

Kit contents

Choosing the channel count and the sensors

WQ-310, WQ-320 and WQ-330 differ in the number of channels (one, two, three). Pick the WQ-330-K when a survey normally needs pH, conductivity and oxygen together, as in river, lagoon, well and effluent work. Sensor suffix -2 or -5 is the cable length in metres: 2 m for bench and shoreline, 5 m for tank and wet-well sampling.

Cartridge-type sensors (300-P-C for pH; 300-4C-C or 300-2C-C for conductivity; 300-O-C for ORP) can be replaced separately when worn. After changing an EC cartridge, enter its nominal cell constant. Please tell us the parameters you need and we will quote the meter and sensors as one package.

Setting up and keeping the sensors healthy

Plug in a sensor by aligning the arrow on its connector with the groove in the meter plug; any sensor type fits any channel. Use four AA alkaline or Ni-MH cells, or a 5 V USB source, noting that the meter does not charge cells from USB. A micro SD slot sits below the battery box, so remove the cells when changing the card. The manual advises setting the focus on the channel, placing the sensor at least 3 cm in the solution and following the on-screen calibration steps.

Calibration data can be viewed per channel in measurement mode, and the Cal Data Clear command is recommended before recalibrating. The pH head allows resolution, buffer group, calibration alarm and temperature type to be set; the EC head allows cell constant, reference temperature (15 to 30 °C) and temperature coefficient (0 to 10 %/°C, default 2.00 %/°C).

Water-quality surveys in the field

A three-channel instrument fits environmental and utility work in the Gulf: groundwater and well-field checks, treated-effluent and irrigation-water screening, desalination feed and product samples, aquaculture ponds and coastal monitoring. Salinity-corrected oxygen and temperature-compensated conductivity are particularly relevant in saline coastal samples.

Related items

Sensor heads, cartridges, the DO sensor and the BNC adapter are listed above by model code. The LAQUA 200 series offers single-parameter meters for users who do not need three channels.

Frequently asked questions

Does the WQ-330-K include sensors?

No. The kit lists the meter, four AA batteries, a wireless SD card, manuals and a carrying case; sensors are chosen separately.

How are measurements transferred?

By micro USB cable or wirelessly, and a 25-pin printer cable can be used for printouts.

Can I power the meter from USB?

Yes, via micro USB at 5 V, but the manual says the batteries are not charged this way.

What does the sensor condition display show?

Average slope for pH and ion heads, average cell constant for EC heads and membrane condition for DO sensors.

Is Seven Star LLC a Horiba distributor?

No. Seven Star LLC is an independent supplier in Muscat that sources Horiba products on request.

Documents and quotation

Download the official Horiba instruction manual for WQ-330-K from this page. As an independent supplier based in Muscat, Seven Star LLC supplies Horiba items on request: use the quote form with the quantity you need. Check every value in the document against your own specification before you order. Browse similar items in the category.