Need Help ?
Benchtop Multi-parameter Water Quality Meter LMPWM-A31

Benchtop Multi-parameter Water Quality Meter LMPWM-A31

Benchtop multi-parameter water quality meter LMPWM-A31 is comes with different measurement modes for quality and testing of water on different parameters. It measures pH, Conductivity, TDS, Salinity, Resistivity content from the test sample. It stores and recalls up to 500 sets of data. Calibration due reminder informs operator to calibrate the meter regularly.

Specifications Features Applications Standard Accessories Optional Accessories Get Quote View Catalog


pH Mode
pH range -2.00 to 20.00 pH
pH Accuracy ± 0.002 pH
pH Resolution 0.1/0.01/0.001 pH, selectable
pH Calibration Points 1 to 5 Points
pH Buffer Solutions USA (pH 4.0/7.00/10.01) or NIST (pH 4.01/6.86/9.18) or DIN buffers
mV Mode
mV Range -1999.9 to 1999.9 mV
mV Accuracy ± 0.2 mV
mV Resolution 0.1/1 mV, selectable
mV Calibration Points 1 Point
Conductivity Mode
Conductivity Range 0.01 to 20.00, 200.0, 2000 µS/cm, 20.00, 200.0 mS/cm
Conductivity Accuracy ± 0.5% F.S.
Conductivity Resolution 0.01/0.1/1
Conductivity Calibration Points 1 to 5 Points
Conductivity Solutions 10, 84, 1413 µS/cm, 12.88, 111.8 mS/ cm
Conductivity Temperature coefficient 0.0 to 10.0 %/°C
Compensation mode Linear or Pure Water
Cell Constant K=0.1, 1, 10 or Custom
Reference temperature 20 or 25°C
TDS Mode
TDS Range 0 to 10.00, 100.0, 1000 ppm, 10.00, 100 ppt (Max. 200 ppt)
TDS Accuracy ± 1 % F.S.
TDS Factor 0.1  to 1.0 (default 0.5)
Salinity Mode
Salinity Range 0 to 10 ppt (maximum 80 ppt)
Salinity Accuracy ± 1 % F.S.
Measurement modes Seawater or practical salinity
Resistivity Mode
Resistivity Range 0 to 100 MΩ
Resistivity Accuracy ± 1 % F.S.
Resistivity Resolution 0.01, 0.1, 1
Temperature Range 0 to 105°C, 32 to 221°F
Temperature Accuracy ± 0.5°C
Temperature Resolution 0.1°C
Temperature Calibrations Points 1 Point
Temperature Compensation Mode Manual or Automatic
Data Hold Function Manual or Automatic Endpoint Detection
Stability Criteria Low or High
Calibration Due Alarm 1 to 31 Days
Reset Function Yes
Memory Stores Up to 500 data sets
Output USB interface
Connector BNC, 6-pin mini plug
Display LCD
Power supply DC5 V, AC 220 V, 50 Hz
Dimension (L × W × H) 210 × 188 × 60 mm
Weight 1.5 kg


Common Features Stability indicator displays the status of current measurement

Auto hold function freezes stable, final readings for better viewing and recording

Manual temperature calibration to rectify the deviations in temperature

Automatic temperature compensation for accurate measured value over the entire range

Selectable temperature units (°C or °F) for different application requirements

Expanded memory stores and recalls up to 500 readings

Help message as an operational guide, helps users for quick access to the parameters

Reset function automatically resumes all the setting back to factory default options

Store data is transferrable into computer via USB communication interface

pH mode 1-5 points push button calibration to automatically identify pH buffer

Convenient to select pH buffer standard (USA/NIST/DIN) or custom

Automatic electrode slope display helps operator whether to replace the sensor

Conductivity/TDS/ Salinity/Resistivity mode 1-5 point for calibration with automatically identification of calibration solutions

Can select cell constant (0.1/1/10) and normalization temperature (20°C or 25°C)

TDS conversion factor, seawater, practical salinity measurements mode to meet different water quality measurement requirements

Linear or pure water compensation improves the measurement accuracy


Used for quality checking of water on different parameters across research, QC labs, water management plants and others production units.

Standard Accessories

Accessories No. Name
1 pH Electrode (for general liquids)
2 Conductivity Electrode (for general liquids)
3 Temperature probe
4 pH Buffer pouches (pH 4.01/ 7.00/ 10.01)
5 Conductivity standard solutions (10, 84, 1413 µS/cm, 12.88, 111.8 mS/ cm)
6 USB cable
7 DC5 V power adapter

Optional Accessories

Accessories No. Name
1 Temperature probe
2 Calibration Solutions for pH and Conductivity
3 pH electrodes suitable for non-aqueous, high alkalinity, low conductivity, tis buffers, biofuels and others
4 Conductivity electrode suitable for Pure water, general applications, high conductivity liquids
5 DC5V power adapter

Request Quote

Related Products