Milwaukee MW401 PRO Low Range Total Dissolved Solids Meter

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SKU: MW401
Range: 0 to 1990 mg/L (ppm)
Resolution: 1 mg/L (ppm)
Accuracy: ±2% Full Scale @ 25ºC


MW401 is a Portable Low Range Total Dissolved Solids (TDS) Meter with Automatic Temperature Compensation. This instrument has been designed for aquariums, aquaculture, labs, and water conditioning applications to meet the needs for equipment suited from hobbist to professional.  It is also a great meter for food labs, and water treatment applications.

TDS testing provides a method to optimize chemical applications and minimize operational cost. In aquarium and aquaculture applications, high concentrations of solids (TDS) can reduce clarity in water can decrease photosynthesis in aquatic plants.  In water conditioning, a high (TDS) level can affect the clarity and taste of potable drinking water. 

The MW401 has a range of 0 to 1990 mg/L (ppm)  with a 10 mg/L (ppm) resolution. This (TDS) meter is supplied complete with conductivity probe with 1 m (3.3') cable and calibration solution.

Design features

  • 0 to 1999 mg/l (ppm) range.
  • Fast, easy-to-read results with large digital LCD readout.
  • Supplied with conductivity probe attached to a 3 foot cable.
  • Accuracy to ±2% FS @ 25°C.
  • Lightweight and portable.
  • 300 hours of battery life with continuous use (battery included).
  • SE510 Conductivity probe included.
  • Starter Calibration Solution MI0032B, 1382 ppm (included).


  • Range: 0 to 1990 mg/L (ppm)
  • Resolution: 1 mg/L (ppm)
  • Accuracy: ±2% Full Scale @ 25ºC
  • Conversion factor: 0.5
  • Temperature Compensation: Automatic, from 5 to 50ºC / 41F to 122F
  • Conductivity Probe: SE510 (included)
  • Starter Calibration Solution MI0032B , 1382 (ppm) (included)
  • Environment: 0 to 50°C / 32 to 122°F; max RH 95%
  • Battery Type: 1 x 9V alkaline (included)
  • Battery Life: Approx. 300 hours of continuous use
  • Meter Dimensions: 5.6 x 3.1 x 1.25 inches (143 x 80 x 32 mm)
  • Meter Weight: 0.5 lbs (0.23 k g)
  • Packaged Dimensions: 8.35 x 5.71 x 2.74 inches (212 x 145 x 67 mm)
  • Packaged Weight: 0.97 lbs (0.44 k g)