Milwaukee T75 Waterproof Low Range Total Dissolved Solids Pen (TDS)

SKU: 9139-T75~ea

Milwaukee T75 Waterproof Low Range Total Dissolved Solids Pen (TDS)

SKU: 9139-T75~ea
Regular price $70.67 CAD
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Milwaukee T75 Waterproof Low Range Total Dissolved Solids Pen (TDS)

The Milwaukee T75 Waterproof Total Dissolved Solids (TDS) Pen is designed for aquariums, aquaculture, education, water conditioning and many other applications. The T75 helps to make sure that fish have the right TDS balance to keep healthy. TDS also aids in keeping filters clean and up to date for water filtration.


  • Measures Total Dissolved (TDS) direct and with automatic temperature compensation
  • Easy-to-read LCD
  • Ideal range for aquariums (0 to 1999 ppm)
  • Units in ppm easily convertible to uS/cm
  • Factory calibrated with the ability to recalibrate if needed
  • 250 hours continuous use (3 x 1.5V batteries included)
  • Simple one-point calibration
  • Fully waterproof to IP65
  • Replaceable TDS electrode MA73075


  • Range: 0 to 1999 ppm (mg/L)
  • Resolution: 1 ppm (mg/L)
  • Accuracy: ±2% Full Scale
  • Typical EMC Deviation: ±2% Full Scale
  • Calibration: Manual, at 1 point through trimmer
  • Replaceable Probe: MA73075
  • Temperature Compensation: Automatic from 0 to 50°C (32 to 122, with ß=2%/°C
  • TDS Factor: 0.5 scale
  • Environment: 0 to 50°C / 32 to 122°F; max RH 100%
  • Battery Type: 3 x 1.5V Alkaline (included)
  • Battery Life: Approx. 250 hours of continuous use
  • Calibration Solution: M10032B (25 sachets 20 mL ea.)
  • Dimensions: 6 x 1.2 x 0.95 inches (180 x 65 x 32 mm)
  • Weight: 3.5 ounces (0.99 g)

Milwaukee T75 Manual



TDS/PPM electrodes can develop nutrient build up over time. To minimize build up, always rinse the probe in fresh tap or DI water after every use.


The Milwaukee TDS Pen, like all TDS meters, provides a measure of Total Dissolved Solids (ppm) reading of contaminates per unit of volume in a solution.

TDS/PPM is often converted to uS/cm. Different scales include the 500 scale, 650 scale and the 700 scale. 

Your TDS/PPM readings can be approximately converted to uS/cm as shown in the examples below.

1 ppm = 2 uS/cm on the 0.5 factor scale
1 ppm = 1.43 µS/cm on the 442 scale or .70 factor scale

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