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Portable Multi-parameter Water Quality Meter LMPWM-A21

Portable Multi-parameter Water Quality Meter LMPWM-A21

Portable Multi-parameter Water Quality Meter LMPWM-A21 is adapted with different modes for measuring quality of water on different parameters. This meter can measure pH, ORP, Dissolved Oxygen content from test sample. It can store & recalls up to 500 sets of data. It is reliable and user friendly, suitable for outdoor measurements.

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pH mode
pH measurement range(-2.000) to 20.000 pH
pH accuracy± 0.002 pH
pH calibration points1 - 5 points
pH calibration solutionsUSA, NIST, DIN or user defined
ORP measurement
ORP measurement range-1999.9 to 1999.9 mV
ORP accuracy±0.2 mV
ORP calibration points1 point
ORP calibration solutionsmV & relative mV
Dissolved oxygen
DO concentration range0.00 to 20.00 mg/L
DO accuracy± 0.2 mg/L
Calibration points1 - 2 points
Pressure correction60.0 to 112.5 kPa, 450 - 850 mmHg
Salinity correction0 to 50 g/L
% Saturation of Oxygen0.0 to 200.0 %
Accuracy± 2.0 %
Temperature compensation 0 to 100 °C, 32 to 212 °F, Manual or Automatic
Stability conditions Low or high
Calibration due 0 to 31 days
Memory Stores up to 500 data sets
Output USB communication interface
Connector BNC, 6- pin MINI connector
Display LCD
Dimension (L × W × H) 170×85×30 mm
Weight 300 g
Power supply 3 × 1.5 V “AA batteries or DC 5 V power adapter
  • Common Features Calibration due reminder informs operator to calibrate the meter regularly
  • 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
  • ORP mode 1 point offset calibration to adjust the display value to known standard
  • Relative & absolute mV measurements for accurate ORP readings
  • Dissolved oxygen mode 1-2 points calibration using the air-sealed water & zero oxygen solution
  • Manual salinity & barometric pressure compensation for accurate readings

The portable multi-parameter water quality meter is used for quality testing of water, and other solvents on different testing parameters in research and development labs, water resources and plants in nearby or remote area.

pH electrodes
Dissolved oxygen electrode
Conductivity electrode
Temperature probe
pH and conductivity calibration solution
AA Batteries
Plastic Carrying case

Temperature probe
Dissolved oxygen electrode filling solutions
Dissolved oxygen film cap
Dissolved oxygen electrode

Compare Models

Model Temperature compensation Stability conditions Calibration due Memory Output Connector Display Dimension (L × W × H) Weight Power supply
LMPWM-A20 0 to 100 °C, 32 to 212 °F, Manual or Automatic Low or high 0 to 31 days Stores up to 500 data sets USB communication interface BNC, 6- pin MINI connector LCD 170×85×30 mm 300 g 3 × 1.5 V “AA batteries or DC 5 V power adapter
LMPWM-A21 0 to 100 °C, 32 to 212 °F, Manual or Automatic Low or high 0 to 31 days Stores up to 500 data sets USB communication interface BNC, 6- pin MINI connector LCD 170×85×30 mm 300 g 3 × 1.5 V “AA batteries or DC 5 V power adapter
LMPWM-A11 0 to 100 °C, 32 to 212 °F, Manual or Automatic Low or high 0 to 31 days Stores up to 500 data sets USB communication interface - - 185 × 88 × 32 mm 300 g 3 × 1.5 V “AA batteries or DC 5 V power adapter
LMPWM-A10 0 to 100 °C, 32 to 212 °F, Manual or Automatic Low or high 0 to 31 days Stores up to 500 data sets USB communication interface - - 185 × 88 × 32 mm 300 g 3 × 1.5 V “AA batteries or DC 5 V power adapter

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