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Water Hardness Meter with 5 Point Calibration (High Accuracy)
Water Hardness Meter with 5 Point Calibration (High Accuracy)

GAOTek Water Hardness Meter with 5 Point Calibration (High Accuracy)



GAOTek Water Hardness Meter with 5 Point Calibration (High Accuracy) is designed to measure the water quality of calcium and magnesium ion concentration. It is equipped with a clear and bright LCD display that is used to show measured values, mode indicators and help message. It is highly cost-effective. It is equipped with the original British water quality hardness electrode suitable for measuring the ions. It has the USB communication interface which sends the stored data to the PC.

Key Features

  • Professional water hardness meter is equipped with a large backlit LCD display.
  • It supports 2 to 5 points calibration from low to high concentrations.
  • Selectable multiple measurement units, including the mmol/L, mg/L(CaCO3), mg/L(CaO), mmol/L(Boiler), mg/L(Ca), French degree, German degree and English degree.
  • Automatic Temperature Compensation provides accurate reading over the entire range.
  • Calibration Due Reminder prompts user to calibrate the meter regularly.
  • Stability indicator automatically shows current measurement status.
  • Auto-Hold function freezes stable reading for easy viewing and recording.
  • Manual temperature calibration improves the measurement accuracy of meter.
  • Automatic electrode diagnosis shows the slope of sensor.
  • Help message as an operational guide that helps you quickly begin using the meter.
  • System menu allows setting the 7 parameters, including the number of calibration points, stability condition, hold function, auto-power off, etc.
  • Reset feature automatically resumes all settings back to factory default options.
  • Expanded memory stores and recalls up to 500 readings.
  • Built-in real-time clock stamps stored data to meet GLP standard.
  • Stored data can be transferred into computer by USB communication interface.
  • Highly cost-effective.
  • It is simple and easy to use.

Technical Specifications

Water Hardness
Measuring Range 0.05 mmol/L~0.2 mol/L
Measuring Range (CaCO3) 0 ~ 19999 mg/L
Measuring Range (CaO) 0 ~ 11220 mg/L
Measuring Range (Boiler) 0 ~ 400 mmol/L
Measuring Range (Ca) 0 ~ 8020 mg/L
Measuring Range (German Degrees) 0 ~ 1122 °dH
Measuring Range (French Degrees) 0 ~ 2000 °f
Measuring Range (English Degrees) 0 ~ 1404 °e
Accuracy ±1% F. S
Calibration Points 2 to 5 Points
Calibration Solutions 0.001, 0.01, 0.1mmol/L, 0.001, 0.01, 0.1mol/L
Range 32 ℉ – 221 ℉   (0 ℃~ 105 ℃)
Accuracy ±33 ℉ (±0.5 ℃)
Calibration Range Measured value ±50 ℉ (±10 ℃)
Temperature Compensation 32 ℉ ~ 122 ℉ (0 °C ~ 50 °C)
Compensation Mode Manual or Automatic
Hold Function Manual or Automatic endpoint Detection
Stability Conditions Low or High
Calibration Due 0 to 31 Days
Power Off Manual or Automatic (10, 20, 30 Minutes)
Reset Function Yes
Memory Stores up to 500 data sets
Output USB Communication Interface
Connector BNC
Display LCD – 5 in x 4.3 in (130 mm x 110 mm)
Power Requirements DC 5 V, Using AC Adapter, 220 V AC/ 50 Hz
Weight 3 lbs (1.5 kg)
Size Dimensions 8 in x 7.4 in x 2.3 in (210 mm x 188 mm x 60 mm) (L x W x H)

Additional Information:


  • Water Hardness Electrode
  • Temperature Probe
  • USB Cable
  • DC 5 V Power Adapter


GAOTek water hardness meter is equipped with a clear and bright LCD display that is used to show measured values, mode indicators and help message. The following table describes the meaning of each indicator.

Electrode Care and Maintenance:

  • Ensure that the electrode is thoroughly washed with distilled water after each use.
  • DO NOT scratch the sensitive membrane on electrode during the measurement or calibration.
  • If performance becomes sluggish, rinse with dilute detergent, rinse with de-ionised water and immerse the tip in a 1000ppm calcium solution for 1 hour.





 —- Electrode dried out Soak the conductivity electrode in tap water for 10 minutes
Measured value is out of range Check the electrode whether dirty or broken
 Err Incorrect calibration solutions Using the fresh calibration solutions for calibration
Electrode is out of service life Replace the water hardness electrode

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