Milwaukee CD600 Digital TDS Pen – Reliable Accuracy in the Palm of Your Hand

Whether you’re growing hydroponic vegetables, maintaining a crystal-clear aquarium, or fine-tuning a water filtration system, knowing your water’s Total Dissolved Solids (TDS) level is essential. TDS readings help determine whether your water is pure, nutrient-rich, or potentially problematic – and with the Milwaukee CD600 Digital TDS Pen, you get a professional-grade tool that’s accurate, fast, and built for real-world use.

Designed for growers, aquarists, water treatment specialists, and curious DIYers alike, the CD600 simplifies what used to be a lab-only task. With a single press, it gives you immediate insight into the quality of your water – no guesswork, no hassle. From checking nutrient concentrations to evaluating filter performance, this pen-style meter is your go-to companion for portable, on-the-spot TDS monitoring.

Engineered for simplicity and durability, the CD600 is compact enough to fit in your pocket but tough enough to deliver reliable readings day after day. Whether you’re in a greenhouse, kitchen, lab, or out in the field, this tool helps ensure your water meets the right standards every time.

Why Choose the Milwaukee CD600?

• Fast, Accurate Readings
  Get reliable TDS measurements in seconds, with ±2% full-scale accuracy, so you can make quick, informed decisions about your water quality.
• User-Friendly Design
  With a simple one-button operation and easy-to-read digital display, the CD600 is intuitive for beginners and efficient for pros.
• Ready to Use
  Comes factory-calibrated with a 1413 µS/cm calibration solution and includes a protective cap and batteries – everything you need to get started right away.
• Portable & Durable
  Designed for one-handed use and built to last with a rugged ABS housing, the CD600 goes wherever you go.
• Versatile Applications
  Ideal for hydroponics, aquariums, reverse osmosis systems, water treatment, environmental testing, beverage production, and more.

Applications at a Glance

• Hydroponics & Indoor Growing – Measure nutrient concentration to prevent under- or overfeeding.
• Aquariums & Aquaculture – Keep dissolved solids in check for healthier aquatic environments.
• Water Purification & RO Systems – Verify filter performance and ensure water quality.
• Drinking Water Testing – Quickly assess the safety and taste of your water supply.
• Industrial & Laboratory Use – Ensure consistent water quality in process environments and research settings.

Proper Care & Maintenance

To ensure long-lasting performance and accurate readings, follow these care tips:

Storage

Always store the CD600 with the protective cap on and away from extreme heat or humidity. While TDS meters don’t have glass bulbs like pH probes, keeping the sensor clean and dry when not in use helps extend its life.

Cleaning

Regularly rinse the probe with distilled or deionized water after each use to remove any residue that could affect measurement accuracy. If deposits or staining occur, gently clean the tip using a soft cloth or brush with isopropyl alcohol.

Calibration

Although the CD600 comes factory-calibrated, it’s good practice to recalibrate monthly or after heavy use. Use a standard TDS calibration solution (e.g., 1382 ppm NaCl) and follow the instructions in the user manual. Proper calibration ensures long-term accuracy.

Battery Maintenance

Replace batteries when the display dims or the meter becomes unresponsive. The CD600 uses 4 x 1.5V batteries, which are easy to change without tools.

CONVERTING TDS TO EC

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

Thank you for considering Milwaukee to help you take your results to the next level.

Take control of your water quality today with the Milwaukee CD600 – compact, dependable, and ready for whatever challenge your water throws your way.