SKU: 44355740267

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

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Description

Milwaukee C66 Waterproof High Range Conductivity Pen with ATC and Replaceable ElectrodeMilwaukee C66 Waterproof High Range Conductivity Pen with ATC and Replaceable Electrode The Milwaukee Conductivity Pen is designed for hydroponic and other growers. It helps to make sure that plants are receiving the right amount of nutrients. Features: Measures conductivity and temperature with automatic temperature compensation Ideal range for hydroponics (0. 00 to 10. 00 mS cm) Units in mS cm easily convertible to ppm Factory calibrated with the

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

The Milwaukee Conductivity Pen is designed for hydroponic and other growers.  It helps to make sure that plants are receiving the right amount of nutrients.

Features:

  • Measures conductivity and temperature with automatic temperature compensation
  • Ideal range for hydroponics (0.00 to 10.00 mS/cm)
  • Units in mS/cm easily convertible to ppm
  • Factory calibrated with the ability to recalibrate if needed
  • Replaceable electrode
  • Fully waterproof to IP65
  • 250 hours continuous use (3 x 1.5V batteries included)

 Specifications:

  • Range: 0.00 to 10.00 mS/cm
  • Resolution: 0.01 mS/cm
  • Accuracy: ±2% Full Scale
  • Typical EMC Deviation: ±2% Full Scale
  • Temperature Compensation: Automatic from 5 to 50°C, with ß=2%/°C
  • Calibration: Manual, at 1 point through trimmer
  • Probe: MA73076 (replaceable)
  • Environment: 0 to 50°C / 32 to 122°F; max RH 100%
  • Battery Type: 3 x 1.5V (included)
  • Battery Life: Approx. 250 hours of continuous use
  • Dimensions: 6.5 x 1.2 x 1.2 inches
  • Weight: 3.5 ounces

Milwaukee C66 Manual


CARE AND USE

MAINTENANCE

EC electrodes can develop nutrient build up over time. To minimize build up, always rinse the probe in fresh tap water after every use.

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.

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.

2.00 mS/cm = 2000 uS/cm = 1000 ppm on .50 factor scale
2.00 mS/cm = 2000 uS/cm = 1400 ppm on the 442 scale or .70 factor scale

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 44355740267

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Elijah
Chelsea, US
★★★★★ 4
Mostly nice
Size: Medium, Color: White-black
Buttons on the back can be uncomfortable
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Reviewed in the United States on February 7, 2026
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Paris M.
Massapequa, US
★★★★★ 5
Great
Size: XX-Large, Color: Red-blue
Exactly what I ordered
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Reviewed in the United States on March 7, 2026
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Caitlin Sullivan
Lake Worth, US
★★★★★ 1
Not what is expected
Size: Small, Color: Black-red, Size: Small, Color: Black-red
There are buttons on the back that go all the way down that personally in my opinion ruins the style!! Will be returning because that is not what I expected.
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Reviewed in the United States on January 20, 2026
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JayeT
Massapequa, US
★★★★★ 3
Faded Glory 😂 3.5 rating
Size: XX-Large, Color: Black-red, Size: XX-Large, Color: Black-red
Sooo faded I didn’t even want to try it on. And very dusty and ashy looking but only the red. It’s as if they had someone wear and wash it and return it and they took the red side and buttoned it onto another color and shipped it out. Guess these sellers like faded clothes. I wouldn’t buy certain colors seeing ppl talking about how the color doesn’t even last even upon its arrival. But if you have dye it’s your best bet to have some on hand when you order or even good for DIY projects. Good thing is I did try it on and it fits and feels like good quality with good weight to it. May have to go up a size I’m a female with big breast. Seems like it may last, just not the color. Good stitch work buttons seem sturdy. Yea these shirts would be great for DIY work
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Reviewed in the United States on January 14, 2026
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Valarie hatcher
Belleville, US
★★★★★ 5
Great jacket
Size: X-Large, Color: Black-red
My son loves this jacket
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Reviewed in the United States on January 19, 2026

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