Extech Combination pH and Conductivity meter - EC500

In stock

This waterproof 5 in 1 meter lets you measure electrical conductivity, the pH, total dissolved solids, salinity and temperature all in an easy to use meter. Includes auto-ranging and 8 selectable conductivity scales.

Extech Waterproof Conductivity, pH, TDS, Salinity and Temperature Meter

We recommend you purchase the EC510 kit for $30 extra which includes all the calibration solutions, hard carry case and sampling vials and vial stand.

Click here to watch demonstration video.

This 5 in 1 multi range sensor easily measures the electrical conductivity, the pH, the total dissolved solids (TDS), the salinity and the temperature all in one easy to use meter. This meter is excellent because it saves you money and gives you precise digital readings. This meter is auto ranging with 8 selectable units including µS/cm, mS/cm, ppm, ppt, mg/L, and g/L. The rugged flat surface pH electrode gives you an accurate and repeatable reading every time.

Features an adjustable conductivity to TDS ratio factor from 0.4 to 1.0 which conveniently calculates the TDS value. Displays an analog bar graph so you can follow measurement trends. Also holds your data and has an auto power off and low battery indicator. The display simultaneously shows conductivity or TDS plus the temperature.

The internal memory stores up to 25 labeled readings for easy recall and to limit the need for retesting. This also has a handy self calibration feature upon power up. This waterproof meter means you can use it in the field without worrying about damp or wet conditions. Also comes with conductivity cell, sensor cap, sample cup with cap, four 3V CR2032 button batteries and 48" neck strap.

Specifications Ranges Maximum Resolutions Basic Accuracy

0 to 199.9μS/cm

200 to 1999μS/cm

2.00 to 19.99mS/cm




±2% FS


0 to 99.9ppm (mg/L)

100 to 999ppm (mg/L)

1.00 to 9.99ppt (g/L)

0.1ppm (mg/L)

1ppm (mg/L)

0.01ppt (g/L)

±2% FS


0 to 99.9ppm (mg/L)

100 to 999ppm (mg/L)

1.00 to 9.99ppt (g/L)

0.1ppm (mg/L)

1ppm (mg/L)

0.01ppt (g/L)

±2% FS


0.00 to 14.00pH




23° to 194°F (-5 to 90°C)






25 datasets


1.4 x 6.8 x 1.6" (36 x 173 x 41mm)


3.8oz (110g)

Unit Ship Weight 2 lbs    
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