Milwaukee PRO Waterproof 3-in-1 Conductivity/TDS and Temperature Tester with Replaceable Probe

Categories: SKU: EC59

The Milwaukee EC59 PRO Conductivity (EC) & Total Dissolved Solids (TDS) Tester is designed for aquaculture, food, wine, laboratory, water treatment, and many other applications. It is the ideal meter to help make sure that your EC/TDS/Temp. needs are being met and are reliable results for your analysis. Keep EC/TDS/TEMP. in your target range to help you achieve best results.


  • EC Range: 0 – 3999 uS/cm
  • TDS Range: 0 – 2000 ppm
  • Temp Range: 0.0 to 60.0°C / 32.0 to 140.0°F
  • EC Resolution: 1 uS/cm
  • TDS Resolution: 1 ppm
  • Temp Resolution: 0.1°C / 0.1°F
  • EC Accuracy: 2% Full Scale
  • TDS Accuracy: 2% Full Scale
  • Temp Accuracy: ±0.5°C / ±1°F
  • EC Typical EMC Deviation: 2% Full Scale
  • TDS Typical EMC Deviation: 2% Full Scale Temp
    Typical EMC Deviation Temperature: ±0.5°C / ±1°F
  • Calibration: Automatic, 1 point
  • Temperature Compensation: Automatic, with β=0.0 to 2.4%/°C
  • Probe: Mi59P (replaceable)
  • Environment: 0 to 50°C / 32 to 122°F; max RH 100%
  • Battery Type: 4 x 1.5V; IEC LR44, A76 (included)
  • Battery Life: Approx. 100 hours of use
  • Auto-off: After 8 minutes of non-use
  • Dimensions: 7.9 × dia 1.5 inches
  • Weight: 3.5 ounces


  • Measures EC/TDS/Temp. with automatic temperature compensation (ATC).
  • Ideal range for all different applications (0 to 3999 uS/cm) | 0 to  2000 ppm | 0.0 to 60°C (32.0 to 140.0°F). 
  • Units in uS/cm or ppm easily convertible to other ranges.
  • Factory calibrated with the ability to recalibrate if needed.
  • Replaceable electrode Mi59P.
  • Fully waterproof to IP65.
  • Approximately 100 hours of use (4 x 1.5V batteries included)



EC electrodes can develop nutrient buildup over time. To minimize build-up, always rinse the probe in fresh tap water after every use.


The Milwaukee PRO Conductivity Tester, like all conductivity meters, provides a measure of electrically charged ions in a solution and is an absolute measure of conductivity.

EC/TDS can be converted. Different scales include the 500 scale, 650 scale and the 700 scale. 

Your uS/cm reading can be approximately converted to other scales as shown in the examples below.

2.00 mS/cm = 2000 uS/cm = 1000 ppm on .50 factor scale

2.00 mS/cm = 2000 uS/cm = 1400 ppm on the 442 scale or .70 factor scale

Testing Parameters

Conductivity, TDS, Temp

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