Milwaukee C66 Waterproof High Range Conductivity Pen with ATC and Replaceable Electrode

Milwaukee C66 Waterproof High Range Conductivity Pen with ATC and Replaceable Electrode

The Milwaukee C66 Waterproof EC Tester is a compact, rugged, and high-precision tool designed for accurate conductivity measurements in a wide range of applications. Whether you’re monitoring nutrient levels in hydroponics, checking salt buildup in aquaculture, managing pool chemistry, or working in industrial water treatment, the C66 ensures you stay in control.

Built for demanding environments, this pocket-sized tester is IP67 waterproof rated, features a replaceable EC electrode, and includes automatic temperature compensation (ATC) for reliable results even in fluctuating conditions. Covering a measurement range of 0.00 to 10.00 mS/cm, it’s the go-to choice for professionals and hobbyists who demand accuracy, durability, and ease of use.

Key Features

• Wide measurement range: 0.00 – 10.00 mS/cm

• Replaceable EC electrode for long-term reliability

• Waterproof, IP67-rated design for rugged field use

• Automatic temperature compensation (ATC) for consistent accuracy

• One-point manual calibration for simple setup

• Compact and portable design for convenience

• Battery life indicator with auto-off function

Applications

• Hydroponics & Agriculture: Monitor nutrient concentrations in soil and hydro systems for healthy growth

• Aquaculture & Aquariums: Maintain correct dissolved salt levels for aquatic life

• Water Treatment & Wastewater Management: Assess conductivity to evaluate impurities or salinity

• Food & Beverage Industry: Ensure product consistency and safety through ionic content testing

• Educational & Research Laboratories: Practical tool for experiments and student training

• Swimming Pools & Spas: Maintain chemical balance in recreational water facilities

Proper Care & Maintenance

• Rinse the probe with distilled water after each use to prevent residue buildup

• Calibrate regularly using EC calibration solution for reliable accuracy

• Store in a dry, cool place and replace the probe cap after use

• Replace the electrode when readings become unstable or calibration fails

• Avoid extreme heat, direct sunlight, and freezing conditions

• Rinse in fresh tap water after every use to minimise nutrient buildup

Converting EC to TDS

The C66 measures conductivity directly in mS/cm, but values can be converted to TDS (ppm) using conversion factors.

• 2.00 mS/cm = 2000 µS/cm = 1000 ppm (0.50 factor scale)

• 2.00 mS/cm = 2000 µS/cm = 1400 ppm (0.70 factor scale / 442 scale)

  Note: True PPM can only be determined via chemical analysis.

Specifications

• Model: Milwaukee C66 Waterproof EC Tester

• Range: 0.00 – 10.00 mS/cm

• Waterproof Rating: IP67

• Electrode: Replaceable EC probe

• Compensation: Automatic temperature compensation (ATC)

• Calibration: One-point manual

• Functions: Battery life indicator, auto-off

• Weight: 0.12 kg

• Dimensions: 18 × 7.5 × 4 cm (L × W × H)

• Power Supply: Batteries included