MW801 pH Meter




pH and TDS are critical for water conditioning and aquariums. Total Dissolved Solids in drinking water can effect clarity and taste of water. In addition, high TDS levels can effect the health of a fish in an aquarium.  High concentrations of TDS can decrease clarity of water in aquariums and decrease photosynthesis in aquatic plants.

The MW801 Low Range Combo Meter lets you easily and accurately test pH, conductivity and total dissolved solids (TDS) using a single meter and integrated probe.

Simple, portable and rugged. No more juggling multiple electrodes and wires. Automatic temperature compensation included.

The MW801 is the ultimate solution for pH and nutrient management.


The design of the MW801 is focused on simple operation and ruggedness. With a single probe, big screen, easy calibration, the MW801 is exceptionally simple to operate.

A tough meter build and a rugged but replaceable probe means that you can expect years of use.

The Combo meter offers:

  • pH, conductivity / nutrient EC, TDS (ppm) with automatic temperature compensation.
  • A replaceable, integrated pH, EC, and TDS (ppm) probe with a single 3 foot cable for easy use (SE600 probe included).
  • A fiber junction on the pH sensor to reduce contamination when measuring fertilizer solutions.
  • A light weight and portable form factor at just 5.8 ounces with battery and just over 3 inches wide.
  • A large easy to read display.
  • Factory calibration with a simple, single point manual calibration for both pH and EC.
  • A reputation for a rugged build and long life
  • Specialized design for drinking water, aquaponic, and aquariums.

Care and Use

The MW801 PRO Combo Meter includes both a pH and EC sensor in the SE600 integrated probe.  All pH sensors have a limited life and response time gets longer with age.  EC sensors are more robust but can still be affected by residue build up. Both need maintenance. Properly maintaining your probe will give you fast, accurate results for longer.  So, be sure to order the Milwaukee codes MA9015 and MA9016 at checkout time!  This will be needed to help clean and condition the pH/EC electrode before use!

Here are our top four tips.

1. Always store with the cap full of buffer or storage solution not water.
2. Clean your probe regularly by soaking in cleaning solution.
3. Calibrate after cleaning and/or storage before testing to adjust for changes in the pH and EC sensor.
4. Gently stir the probe in the sample for a faster result.


Technical Specifications

pH Range: 0.0 to 14.0 pH

EC Range: 0 to 1990 uS/cm

TDS Range: 0 to 1990 ppm

pH Resolution: 0.1 pH

EC Resolution: 10 uS/cm

TDS Resolution: 10 ppm

pH Accuracy: ±0.2

EC/TDS Accuracy: ±2% Full Scale

Calibration Solutions: M10007B (pH 7.01) M10031B (1413 uS/cm) M10080B (800 ppm)

Conversion Factor: 0.5

Calibration: Manual at 1 point pH & EC

Temperature Compensation: Automatic from 32 to 122°F (0 to 50°C)

Probe: SE600 combination pH/EC/TDS probe

Environment: 32 to 122°F / 0 to 50°C; max RH 95%

Battery Type / Battery Life: 1 x 9V alkaline / 150 hours of use

Dimensions Meter: 7.3 x 3.2 x 1.8 inches (185 x 82 x 45 mm)

Weight: 0.36 lbs. (with battery) (0.165 kg)

Dimensions Package: 11 x 4.8 x 4.65 inches (268 x 122 x 118 mm)

Weight Packaged: 1.41 lbs. (0.64 kg)

Contact us

If you have any questions or require further information, please do not hesitate to email us at [email protected], call us on +44 (0)113 286 4536 or submit a contact form.