Environmental Monitoring

Water Quality Testing Equipment

Q: What is the difference between the benchtop and portable COD analysers?

Both digest and measure COD, ammonia nitrogen, total phosphorus and total nitrogen. The benchtop version stores more curves and records for busy laboratories, while the portable version runs on battery or vehicle power for testing at the sampling site.

Q: Can bacteria be tested outside the laboratory?

Yes. The portable bacteria kit includes a vacuum filtration set and culture holder, so samples can be filtered and incubated in the field for total bacteria, E. coli and other indicator organisms.

Q: How often should pH and conductivity meters be calibrated?

Calibrate with fresh standard buffers or solutions at the start of each working day, or more often when accuracy is critical, and record each calibration as part of the laboratory quality system.

Benchtop and portable instruments for drinking water, groundwater, irrigation water, wastewater and aquaculture, from routine pH checks to nutrient and metal analysis.

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Knowing what is in the water

Water quality testing equipment measures the chemical, physical and microbiological condition of water. Photometric analysers cover nearly a hundred parameters, including COD, ammonia nitrogen, total phosphorus and total nitrogen, dedicated testers target individual heavy metals and compounds, turbidity meters assess clarity and suspended solids, and field kits culture coliform and other bacteria on site. Electrochemical meters measure pH, conductivity, TDS, ions and dissolved oxygen. Water utilities, environment ministries, wastewater plants, irrigation authorities, aquaculture farms, universities and food plants use them daily. ASFAN supplies, installs and supports water testing equipment and helps specify complete water laboratories.

Water Quality Testing Equipment

Benchtop Multi-Parameter Water Quality Analyzer

Passes a single wavelength of light through the sample and, according to the Lambert-Beer law, calculates the concentration of a substance from the measured absorbance. Measures concentration, absorbance and transmittance for nearly 100 water quality parameters.

Selectable wavelengths340, 420, 440, 470, 520, 540, 560, 610, 630, 660, 680, 700 nm
Absorbance errormax 0.005
Measurement errorgenerally 5%, individual 10%
Absorbance range-2.00 to 2.000

Features & full specifications

Key features

Nearly 100 water quality parameters; results can be saved, printed, queried or uploaded to a computer
Selectable measurement wavelength
Backup of user-calibrated curves and data records, recoverable after accidental loss
Built-in calibration function eliminates long-term drift
5-inch color touch screen
Light intensity adjustable in 16 levels
Users can add, calibrate and save their own curves
Full calibration history can be queried (curve equation, standards, absorbance, time, operator)

Technical specifications

Selectable wavelengths	340, 420, 440, 470, 520, 540, 560, 610, 630, 660, 680, 700 nm
Absorbance error	max 0.005
Measurement error	generally 5%, individual 10%
Absorbance range	-2.00 to 2.000
Power supply	AC220V (165V~240V), 30W
Instrument size	400x310x158mm
Instrument weight	5kg
Working environment	10-35°C, humidity ≤90%

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COD, Ammonia Nitrogen, Total Phosphorus and Total Nitrogen Analyzer

Directly measures COD, ammonia nitrogen, total phosphorus and total nitrogen in water samples. COD uses fast digestion optical method, ammonia nitrogen the Nessler reagent method, total phosphorus the molybdenum blue method and total nitrogen the alkaline potassium persulfate method.

COD range5~2000 mg/L (extendable to 20000 mg/L)
Ammonia nitrogen range0.02~25 mg/L
Total phosphorus range0.00~10 mg/L
Total nitrogen range0.10~150 mg/L

Features & full specifications

Key features

High-brightness, long-life cold light source with high stability and repeatability
Separate digester and main unit so digestion does not affect optical stability
PID-controlled digester temperature and timing
Free setting of digestion temperature and time
Standard version stores 300 curves and 1000 records; upgraded version stores 3500 curves and 100000 records with improved optics
3.5-inch color touch screen digester display

Available configurations

Standard version: 300 curves, 1000 records
Upgraded version: 3500 curves, 100000 records, improved optical stability

Technical specifications

COD range	5~2000 mg/L (extendable to 20000 mg/L)
Ammonia nitrogen range	0.02~25 mg/L
Total phosphorus range	0.00~10 mg/L
Total nitrogen range	0.10~150 mg/L
Indication error	≤±5% (COD, total phosphorus, total nitrogen), ≤±3% (NH3-N)
Repeatability	≤±3%
Anti-chlorine interference	≤2000 mg/L (COD)
Digestion temperature	COD 165°C, total phosphorus 120°C, total nitrogen 125°C (settable to 200°C)
Batch volume	16 water samples (optional 20, 25, 36)
Main unit	400mm × 310mm × 158mm, 5kg

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Turbidity, Color and Suspended Solids Meter

Measures turbidity, chroma and suspended matter in drinking water, surface water, groundwater and other water.

Turbidity range0.00~400 NTU
Chroma range0.0 to 500 CPU
Suspended matter range0-1000 mg/L
Accuracy≤±2% F.S (turbidity, suspended matter), ≤±3% F.S (chroma)

Features & full specifications

Key features

Cold light and monochromatic light source with excellent optical stability
Large-screen LCD with integrated settings, calibration and recording
V/F conversion, software redundancy and software trap for strong anti-interference
Stores 10 working curves and 500 records; user calibration; data retained on power loss
Built-in printing

Technical specifications

Turbidity range	0.00~400 NTU
Chroma range	0.0 to 500 CPU
Suspended matter range	0-1000 mg/L
Accuracy	≤±2% F.S (turbidity, suspended matter), ≤±3% F.S (chroma)
Repeatability	≤3%
Optical stability	absorbance drift < 0.002A within 20 min
Dimensions	340 × 250 × 130 mm
Weight	4kg
Working environment	5 to 40°C, ≤85%RH
Power supply	AC (220±22) V; (50±0.5) Hz

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Single-Parameter Heavy Metal and Compound Water Tester

Uses narrow-band laser technology to produce a single wavelength; absorbance is measured by colorimetry under microcomputer control and the concentration is calculated automatically by the Lambert-Beer law. Configurable for one of many heavy metals, inorganic salts or other compounds.

Heavy metalscopper, manganese, nickel, aluminum, hexavalent chromium, total chromium, iron, cadmium, zinc, barium, mercury, beryllium, antimony, lead, molybdenum, silver, boron
Inorganic saltssulfate, phosphate, nitrate, nitrite, cyanide, sulfide, fluoride, chloride, silica
Other parametersiodine, arsenic, alkalinity, residual chlorine, hardness, chlorine dioxide, available chlorine, organics, ozone, anionic surfactant

Features & full specifications

Key features

Cold light and monochromatic light source, stable optics
Factory preset curves that can be queried; user calibration
Large LCD with integrated settings, calibration and recording
Software redundancy and software trap for anti-interference
Customizable measurement parameter

Technical specifications

Heavy metals	copper, manganese, nickel, aluminum, hexavalent chromium, total chromium, iron, cadmium, zinc, barium, mercury, beryllium, antimony, lead, molybdenum, silver, boron
Inorganic salts	sulfate, phosphate, nitrate, nitrite, cyanide, sulfide, fluoride, chloride, silica
Other parameters	iodine, arsenic, alkalinity, residual chlorine, hardness, chlorine dioxide, available chlorine, organics, ozone, anionic surfactant

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Portable Multi-Parameter Water Quality Analyzer (Field Case)

A portable case-type analyzer for surface water, groundwater, source water, drinking water, sewage outlets, seawater and other water bodies. pH and conductivity are measured by electrochemical sensors, turbidity by light scattering (or scattering plus transmission), and other items by optical colorimetry.

Measurement itemsabout 60 items incl. COD, ammonia nitrogen, total/residual chlorine, phosphate, nitrite, nitrate, heavy metals, pH, dissolved oxygen, conductivity, suspended solids, turbidity, chroma
Curve storage300 curves
Record storage1000 records
Display5-inch color touch screen

Features & full specifications

Key features

Wavelength selected automatically, no calibration required
5-inch color touch screen
Convenient for on-site inspection
Stores 300 curves and 1000 timestamped records
USB interface and PC data acquisition software
Cold light source with narrow-band interference optics
Power-off data protection and record printing
Rechargeable lithium battery with battery detection
One-click recovery of factory and user curves
Password-protected settings
Self-calibration to eliminate long-term drift

Technical specifications

Measurement items	about 60 items incl. COD, ammonia nitrogen, total/residual chlorine, phosphate, nitrite, nitrate, heavy metals, pH, dissolved oxygen, conductivity, suspended solids, turbidity, chroma
Curve storage	300 curves
Record storage	1000 records
Display	5-inch color touch screen
Interface	USB
Power	rechargeable lithium battery

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Portable COD, Ammonia Nitrogen, Total Phosphorus and Total Nitrogen Analyzer

Uses high-temperature sealed catalytic digestion and monochromatic light for colorimetric measurement. Compact and easy to carry with its own lithium battery; digestion and colorimetry use the same tube without external power supply.

COD range5~2000 mg/L
Ammonia nitrogen range0.02~25 mg/L
Total phosphorus range0.00~10 mg/L
Total nitrogen range0.05~100 mg/L

Features & full specifications

Key features

Digester separate from the analyzer; PID control of temperature and timing
Low-power 16-bit single-chip system, standby time over 6 months
Power options: car cigarette lighter, high-capacity portable lithium battery or 220V
Imported cold light source with narrow-band filter, very stable optics
Large LCD display
Data retained on power loss
30 standard curves and 199 timestamped measurements stored
USB port for PC reading or printing
Molded ABS housing, IP65 design: anti-corrosion, waterproof and dust-proof
High-strength carrying suitcase

Technical specifications

COD range	5~2000 mg/L
Ammonia nitrogen range	0.02~25 mg/L
Total phosphorus range	0.00~10 mg/L
Total nitrogen range	0.05~100 mg/L
Indication error	≤±5% (COD, total nitrogen), ≤±3% F.S (ammonia nitrogen), ≤±5% F.S (total phosphorus)
Repeatability	≤3%
Temperature control accuracy	±0.5°C
Digestion time	COD 15 min; total phosphorus and total nitrogen 30 min (adjustable 1 to 999 min)
Batch volume	4 water samples (or 16 water samples)
Wavelengths	COD 420nm and 610nm, ammonia nitrogen 420nm, total phosphorus 700nm, total nitrogen 340nm
Dimensions	analyzer 80 × 230 × 55 mm; digester 105 × 160 × 90 mm
Weight	analyzer 0.5kg; digester 1kg

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Aquaculture Water Quality Analyzer

Determines water quality parameters in aquaculture, including salinity, pH, dissolved oxygen, ammonia nitrogen, sulfide, nitrite, mercury and cadmium.

pH5.00-8.00
Salinity0.0-28.0
Dissolved oxygen0.10-10.0 mg/L
Ammonia nitrogen0.02-25.0 mg/L

Features & full specifications

Key features

Long-life light source and high-stability optical system for good repeatability
10 standard curves and 500 measurements stored; data retained on power loss
Large LCD display
Built-in printing of current and historical records
USB interface to computer

Technical specifications

pH	5.00-8.00
Salinity	0.0-28.0
Dissolved oxygen	0.10-10.0 mg/L
Ammonia nitrogen	0.02-25.0 mg/L
Nitrite	0.02-5.00 mg/L
Sulfide	0.005-1.00 mg/L
Mercury	0.002-0.5 mg/L
Cadmium	0.01-0.5 mg/L
Indication error	≤±5% (F.S)
Dimensions / weight	340mm × 250mm × 130mm, 4kg

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Portable Water Bacteria Detection Kit

A portable microbiology kit with a multifunctional culture medium holder for detecting total bacteria, E. coli, fecal E. coli, fecal streptococcus, Salmonella and other items in water on site.

Portabilityequipment and consumables in a solid portable box
Culture conditions30 groups of custom culture temperatures, 20~50℃, custom duration, microbial recovery mode
Temperature controlthermistor pair with automatic temperature identification, cooling and temperature calibration
Filter membrane0.45 µm

Features & full specifications

Key features

Works with dry powder medium or prefabricated media
Automatic vacuum pump and filter kit with 0.45 µm membrane for on-site sample filtration
Holds 7 nutrient plates or 20 aluminum dishes at once
Timed reminders and automatic shutdown
Filter parts can be flame-sterilized at the sampling site
Screen or voice prompts, multiple languages

Technical specifications

Portability	equipment and consumables in a solid portable box
Culture conditions	30 groups of custom culture temperatures, 20~50℃, custom duration, microbial recovery mode
Temperature control	thermistor pair with automatic temperature identification, cooling and temperature calibration
Filter membrane	0.45 µm
Capacity	7 nutrient plates or 20 aluminum dishes

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Benchtop pH Meter

A benchtop pH/mV meter with a 6.0-inch high-resolution LCD, electrode stand, 1-3 point calibration with automatic buffer recognition and temperature compensation.

pH range-2.00 to 18.00 pH
pH resolution0.01 pH
pH accuracy±0.01 pH
Calibration pointsUp to 3

Features & full specifications

Key features

6.0-inch high-resolution LCD
Auto-read and continuous-read modes
Auto-hold locks the measurement endpoint
50 data sets stored per parameter
Reset to factory defaults
IP54 waterproof
1-3 point calibration with standard (NIST buffer) recognition

Available configurations

Automatic temperature compensation version, measures pH / temperature (mV)
Manual temperature compensation version, measures pH / mV

Technical specifications

pH range	-2.00 to 18.00 pH
pH resolution	0.01 pH
pH accuracy	±0.01 pH
Calibration points	Up to 3
Standard recognition	NIST buffers
mV range	-1999 to 1999 mV
mV resolution	1 mV
mV accuracy	±0.1 %FS
Temperature range	-5 to 110 °C, 23 to 230 °F (automatic version)
Temperature accuracy	±0.2

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Benchtop Conductivity / TDS Meter

A benchtop conductivity meter with 6.0-inch LCD, 1-point calibration with standard recognition and settable cell constant; also reads TDS.

Conductivity range0.00 µS/cm to 200 mS/cm
Resolution0.01 µS/cm minimum; changes with range
Accuracy±1.0 % FS
Reference temperature25 °C

Features & full specifications

Key features

6.0-inch high-resolution LCD
1-point calibration with standard recognition
Settable cell constant
Automatic or manual temperature compensation
Auto-hold, 50 data sets per parameter
IP54 waterproof

Available configurations

Automatic temperature compensation version, measures EC / temperature (TDS)
Manual temperature compensation version, measures EC (TDS)

Technical specifications

Conductivity range	0.00 µS/cm to 200 mS/cm
Resolution	0.01 µS/cm minimum; changes with range
Accuracy	±1.0 % FS
Reference temperature	25 °C
Calibration points	Up to 1
Standard recognition	146.5 µS/cm, 1408 µS/cm, 12.85 mS/cm, 111.3 mS/cm
TDS range	0.00 mg/L ~ 100 g/L
TDS resolution	0.01 mg/L minimum; changes with range
TDS accuracy	±1.0% FS
Temperature range	-5 to 110 °C, 23 to 230 °F (automatic version)

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Advanced Multi-Parameter Benchtop Meter

A research-grade benchtop meter series with color touchscreen and an intelligent operating system for user, calibration, electrode, method and data management. Available as a full multi-parameter unit or as dedicated pH, conductivity, ion (ISE) or dissolved oxygen meters.

pH range-2.000 to 20.000 pH, accuracy ±0.002 pH
mV/ORP range-2000.00 to 2000.00 mV, accuracy ±0.1 mV or ±0.03%
ISE range0~19990, accuracy ±0.3%
Conductivity range0.000 µS/cm to 3000 mS/cm, accuracy ±0.5% FS

Features & full specifications

Key features

Color high-contrast LCD touchscreen
User, calibration, electrode, method and data management
Auto-read, timed-read and continuous-read
Automatic/manual temperature compensation
Auto-hold endpoint detection
Up to 1000 data sets per parameter (GLP-compliant)
Data analysis to review, compare and recalculate results
USB or RS-232 output to PC or printer
Automated measurement

Available configurations

Full multi-parameter: pH/EC/ISE/DO/temperature (mV/ORP/pX/resistivity/TDS/salinity/DO saturation)
pH meter: pH/temperature (mV/ORP)
Conductivity meter: EC/temperature (resistivity/TDS/salinity)
Ion meter: pH/ISE/temperature (mV/ORP/pX)
Dissolved oxygen meter: DO/temperature (DO saturation)

Technical specifications

pH range	-2.000 to 20.000 pH, accuracy ±0.002 pH
mV/ORP range	-2000.00 to 2000.00 mV, accuracy ±0.1 mV or ±0.03%
ISE range	0~19990, accuracy ±0.3%
Conductivity range	0.000 µS/cm to 3000 mS/cm, accuracy ±0.5% FS
Resistivity range	5.00 Ω·cm ~ 100.00 MΩ·cm
TDS range	0.000 mg/L ~ 1000 g/L, accuracy ±0.5%
Salinity range	(0.00 ~ 8.00)% NaCl, accuracy ±0.1%
Dissolved oxygen	polarographic, 0.00 to 99.99 mg/L, accuracy ±0.1 mg/L; saturation 0.0 to 600%
Temperature	-5 to 130 °C, accuracy ±0.1
Data storage / power	1000 groups; AC adapter 100-240 VAC input, DC24V output

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Portable Multi-Parameter Water Meter

A handheld multi-parameter meter series with 3.5-inch LCD for pH, ORP, ion, conductivity, TDS, salinity and dissolved oxygen measurements, available as multi-parameter or single-parameter versions.

pH range-2.00 to 20.00 pH, accuracy ±0.02 pH
mV range-2000.00 to 2000.00 mV, accuracy ±0.3 mV or ±0.1% of reading
ISE range1E-9 to 9.999E9, accuracy ±0.5%, up to 5 calibration points
Conductivity range0.000 µS/cm to 500 mS/cm, accuracy ±1.0% FS

Features & full specifications

Key features

3.5-inch LCD display
Auto-read, timed-read and continuous-read
Automatic/manual temperature compensation
Auto-hold endpoint detection
Up to 500 data sets per parameter (GLP-compliant)
USB communication
Auto power-off for longer battery life
Reset to factory defaults
IP65 waterproof

Available configurations

Multi-parameter: mV/pX/resistivity/TDS/salinity/DO saturation
Multi-parameter: pH/EC/ISE/temperature (mV/pX/resistivity/TDS/salinity)
pH meter: pH/temperature (mV)
Conductivity meter: EC/temperature (resistivity/TDS/salinity)
Dissolved oxygen meter: DO/temperature (DO saturation)

Technical specifications

pH range	-2.00 to 20.00 pH, accuracy ±0.02 pH
mV range	-2000.00 to 2000.00 mV, accuracy ±0.3 mV or ±0.1% of reading
ISE range	1E-9 to 9.999E9, accuracy ±0.5%, up to 5 calibration points
Conductivity range	0.000 µS/cm to 500 mS/cm, accuracy ±1.0% FS
Resistivity range	5.00 Ω·cm ~ 20.00 MΩ·cm
TDS range	0.00 mg/L ~ 300 g/L, accuracy ±1.0%
Salinity range	(0.00 ~ 8.00)%, accuracy ±0.2%
Dissolved oxygen	polarographic, 0.00 to 50.00 mg/L, accuracy ±0.3 mg/L; saturation 0.0 to 300.0%
Temperature	-5 to 110 °C, 23 to 230 °F, accuracy ±0.2
Data storage / power	500 results each; rechargeable lithium battery, AC adapter 100-240 VAC input, DC5V output

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Drinking water safety

Routine checks of turbidity, pH, bacteria and key contaminants confirm that treated and distributed water stays safe from the treatment plant to the consumer tap.

Wastewater and reuse compliance

COD, nitrogen and phosphorus measurements show whether treated effluent meets discharge or reuse limits, an important step before using it for irrigation or landscaping.

Irrigation water suitability

Conductivity, pH and specific ions reveal salinity and toxicity risks in well and reclaimed water, helping farms protect soil structure and crop yields.

Aquaculture management

Dedicated aquaculture testing of dissolved oxygen, ammonia, nitrite, sulfide and salinity helps farms keep stock healthy and respond quickly when water conditions change.

Frequently Asked Questions

What is the difference between the benchtop and portable COD analysers?

Both digest and measure COD, ammonia nitrogen, total phosphorus and total nitrogen. The benchtop version stores more curves and records for busy laboratories, while the portable version runs on battery or vehicle power for testing at the sampling site.

Can bacteria be tested outside the laboratory?

Yes. The portable bacteria kit includes a vacuum filtration set and culture holder, so samples can be filtered and incubated in the field for total bacteria, E. coli and other indicator organisms.

How often should pH and conductivity meters be calibrated?

Calibrate with fresh standard buffers or solutions at the start of each working day, or more often when accuracy is critical, and record each calibration as part of the laboratory quality system.

Equip your water laboratory

Tell us your water sources, parameters and sample load. ASFAN will recommend benchtop and field equipment and prepare a quotation.

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