Milwaukee C65 Low Range Waterproof Conductivity Pen with ATC and Replaceable Electrode – Precision at Your Fingertips for Everyday Water Monitoring

Whether you're managing a hydroponic system, fine-tuning an aquarium, or checking the quality of irrigation water, precision matters. Even small shifts in water conductivity can significantly impact plant health, aquatic life, or process outcomes. That’s where the Milwaukee C65 comes in – your trusted tool for fast, accurate EC and temperature measurements in low-range environments.

Designed for professionals and serious hobbyists alike, the C65 delivers reliable results right where you need them: in the greenhouse, the classroom, the lab, or in the field. Its low-range EC measurement (0–1999 µS/cm) makes it ideal for freshwater applications, hydroponic nutrient solutions, and irrigation water testing, while the built-in Automatic Temperature Compensation (ATC) ensures accuracy across changing conditions. With a waterproof body and replaceable electrode, this portable meter is built for repeatable performance in real-world conditions.

From agriculture to aquaculture, education to industrial water systems, the C65 offers reliable, user-friendly conductivity testing – backed by Milwaukee’s commitment to quality.

Why Choose the Milwaukee C65?

• Low-Range Precision
  Accurately measures conductivity from 0 to 1999 µS/cm, making it perfect for applications where even small changes in EC matter.
• Automatic Temperature Compensation (ATC)
  Delivers consistent readings regardless of water temperature, ensuring data you can trust.
• Replaceable Electrode
  Extends the life of the device while keeping long-term ownership costs low.
• Waterproof & Durable Design
  IP65-rated for use in humid, wet, or outdoor environments – ideal for greenhouses, farms, or fish tanks.
• Compact and Portable
  Lightweight and pocket-sized for on-the-go testing without sacrificing performance.
• Easy Calibration
  Simple one-point manual calibration ensures accuracy with minimal effort.

Applications of the Milwaukee C65

• Hydroponics
  Maintain nutrient solution balance for optimal plant growth and yield.
• Aquariums
  Monitor EC levels to ensure a stable environment for aquatic life.
• Aquaculture
  Track water salinity and nutrient levels for healthy fish and shellfish farming.
• Agriculture & Irrigation
  Check water salinity to prevent soil damage and support healthy crop production.
• Swimming Pools
  Ensure balanced water chemistry for safety and comfort.
• Education
  A perfect tool for teaching water quality, chemistry, and environmental science in classrooms and labs.
• Food & Beverage
  Monitor water purity and conductivity in production and cleaning processes.
• Industrial Water Treatment
  Keep water systems within desired conductivity ranges to avoid corrosion and scaling.

Proper Care & Maintenance

To ensure the best performance and extend the life of your Milwaukee C65 Low Range Waterproof Conductivity Pen, follow these essential care guidelines:

Rinse After Every Use

EC electrodes can develop nutrient or residue buildup over time. To minimize this, always rinse the probe in fresh tap water or distilled/deionized (DI) water after each measurement. This helps prevent contamination and ensures stable readings.

Calibrate Regularly

Regular calibration is key to maintaining measurement accuracy. Use a certified EC calibration solution and recalibrate weekly if used frequently. One-point manual calibration makes the process quick and simple.

Replace the Electrode When Needed

If your readings become inconsistent or response times slow down, it may be time to replace the electrode. With the C65’s replaceable electrode design, you can restore full performance without needing to replace the entire device.

Store Properly

When not in use, store the C65 in a dry location at room temperature. Avoid exposing it to direct sunlight, excessive heat, or cold to preserve battery life and probe sensitivity.

Understanding EC & TDS Conversion

The Milwaukee C65 measures electrical conductivity (EC), an absolute measurement of ion concentration in a solution. However, EC values are often converted to TDS (Total Dissolved Solids) in parts per million (ppm) for practical purposes.

Different conversion scales exist, and it's important to know which one applies to your process:

• 0.5 Factor Scale:
  1 µS/cm = 0.5 ppm
• 0.7 Factor Scale (442 Scale):
  1 µS/cm = 0.7 ppm

Note: These are approximations. True TDS can only be determined through chemical analysis, as EC meters measure the concentration of charged ions – not their specific chemical makeup.

Compact. Accurate. Built to last.
Trust the Milwaukee C65 to deliver dependable EC and temperature measurements – wherever your work takes you.