MW401 Conductivity Meter


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.


  • 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).


Technical Specifications

Range: 0 to 1999 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)

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.