Milwaukee CD611 Digital Conductivity Pen (EC)

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Overview

Milwaukee CD611 Conductivity Tester – Reliable, Simple, and Accurate EC Measurement

The Milwaukee CD611 Conductivity Tester is designed for users who need fast, accurate, and reliable electrical conductivity (EC) measurements across a wide range of applications. Whether you’re a hydroponic grower fine-tuning nutrient solutions, an aquarist monitoring water quality, or an educator teaching essential chemistry concepts, the CD611 offers an easy-to-use solution with professional-level performance.
With a compact, lightweight design and easy one-point manual calibration, the CD611 is ideal for quick field tests and everyday use. Its precision ±2% Full Scale EC accuracy makes it a trusted tool for professionals and hobbyists alike.
Built to deliver dependable results at an affordable price, the CD611 ensures you can monitor conductivity levels confidently—helping you protect your plants, aquatic life, equipment, and processes with ease.

Why Choose the Milwaukee CD611?

Fast, Accurate Results – ±2% Full Scale EC accuracy for dependable readings.
Simple One-Point Calibration – Quick and easy manual calibration ensures ongoing precision.
Compact & Lightweight – Convenient to carry for on-the-go testing.
Long Battery Life – Up to 250 hours of continuous use with a single battery.
Easy-to-Read LCD Display – Clear digital display for fast data interpretation.

Proper Care & Maintenance:

To ensure accurate and long-lasting performance, proper maintenance of your Milwaukee CD611 Conductivity Tester is essential.

Always rinse the probe with distilled or deionized water after each use to avoid contamination buildup.
Store dry between uses to preserve probe sensitivity and prevent damage.
Calibrate regularly using a conductivity standard solution to maintain measurement accuracy.
Avoid immersing the tester beyond the maximum immersion level indicated on the device.
Replace batteries when the low battery indicator appears to ensure reliable operation.

Converting EC to TDS:

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

In Hydroponics, EC is often converted to TDS in parts per million (ppm). Different scales include the 500 scale, 650 scale and the 700 scale. However, true PPM can only be determined through chemical analysis. Your mS/cm reading can be approximately converted to TDS (ppm) as shown in the examples below.

0,50-factor scale (500 scale):

2,00 mS/cm = 2000 µS/cm = 1000 ppm

0,70-factor scale (442 of 700 scale):

2,00 mS/cm = 2000 µS/cm = 1400 ppm

Following these simple steps will help you extend the life of your CD611 and maintain the precision you need for your daily conductivity measurements.

Specifications:

Range: 0 to 20000 µS/cm
Resolution: 100 µS/cm
Accuracy: ±2% Full Scale
Temperature Compensation: Automatic from 5 to 50°C, with ß=2%/°C
Calibration: Manual, at 1 point through trimmer
Environment: 0 to 50°C / 32 to 122°F; max RH 100%
Battery Type: 4 x 1.5V Alkaline (included)
Battery Life: Approx. 350 hours of continuous use
Dimensions: 32 x 180 x 65 mm
Weight: 60 g

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