Milwaukee C65 EC Meter

The Milwaukee C65 is a waterproof conductivity pen with automatic temperature compensation and a replaceable stainless steel electrode, measuring from 0 to 3999 µS/cm across the full range of horticultural nutrient concentrations. ATC automatically normalises readings to 25 degrees Celsius, eliminating measurement error from temperature variation between reservoirs and grow room conditions. IP65 waterproof rating protects against splashes and dust. Single-point calibration with EC Standard 1413 µS/cm ensures measurement accuracy. The replaceable probe design means electrode wear costs a probe swap rather than a complete new meter. Order from plantandflower.be with fast delivery across Belgium.

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2 Year Warranty 30 days retour

Milwaukee C65 EC Meter – Waterproof Conductivity Pen with ATC and Replaceable Electrode

Nutrient concentration is the single most controllable variable in any feeding programme — but only if you can measure it accurately. The Milwaukee C65 converts electrical conductivity into an actionable number that tells you exactly where your nutrient strength stands. From seedling-stage solutions around 400 µS/cm to bloom-phase concentrations above 2500 µS/cm, this pen covers the full working range with automatic temperature compensation. Calibrate with EC Standard 1.413 for measurement confidence across every growth stage.

C65 specifications and measurement range

The C65 measures conductivity from 0 to 3999 µS/cm (0 to 3.999 mS/cm), covering the complete spectrum from pure water through heavily concentrated bloom-phase solutions. The stainless steel electrode pins provide fast response and resist corrosion in nutrient-rich environments. A stability indicator confirms measurement equilibrium before you record the value. The IP65 waterproof rating protects the electronics against water jets and dust — essential for grow room conditions where wet hands and splashing reservoirs are part of daily operation. Battery life reaches 250 hours on the included cells.

Range 0 – 3999 µS/cm: full horticultural spectrum from propagation through heavy bloom feeding without range switching.
Automatic Temperature Compensation: normalises every reading to 25°C reference, eliminating thermal measurement error.
IP65 waterproof: sealed against water ingress and dust for reliable operation in wet growing environments.
Replaceable electrode: stainless steel pin assembly swaps independently when performance degrades, preserving the meter investment.
250-hour battery life: batteries included, providing weeks of daily measurement without interruption.

ATC: why temperature compensation matters for EC

Conductivity is inherently temperature-dependent. A solution at 30°C conducts measurably better than the identical solution at 20°C — not because the nutrient concentration changed, but because ion mobility increases with temperature. Without compensation, comparing a morning reservoir reading at 18°C to an afternoon reading at 27°C would suggest the concentration changed when it did not. The C65's ATC sensor measures solution temperature simultaneously and applies a correction factor to normalise the result to 25°C. This means your readings are always comparable regardless of when and where you measure. For growers running multiple reservoirs at different temperatures, ATC is not a convenience feature — it is a measurement requirement.

Electrode maintenance for consistent EC readings

EC electrodes accumulate mineral deposits on the stainless steel pins over time — calcium carbonate, phosphate salts and nutrient residues that increase contact resistance and produce artificially low readings. Rinse the probe in clean water after every measurement session. Monthly deep cleaning with dedicated cleaning solution dissolves stubborn deposits. Recalibrate after every cleaning session using EC standard solution, as the cleaned electrode surface may respond differently. When readings remain inconsistent despite cleaning and calibration, a replacement probe restores factory-grade performance at a fraction of the cost of a new meter.

Order the Milwaukee C65 from plantandflower.be with fast shipping across Belgium. Turn nutrient dosing from estimation into precision with a reliable EC reading at every feeding.

What is the measurement range of the Milwaukee C65?

The C65 measures from 0 to 3999 µS/cm (0 to 3.999 mS/cm), covering the full range of nutrient concentrations used in hydroponics and horticulture from seedling through bloom phase. ATC normalises readings to 25°C.

How does automatic temperature compensation work on the C65?

The C65 measures solution temperature simultaneously with conductivity and applies a mathematical correction to normalise the reading to 25°C. This eliminates measurement variation caused by temperature differences between samples and ensures comparable readings regardless of conditions.

How do I convert µS/cm to mS/cm?

Divide by 1000. The C65 displays in µS/cm, so a reading of 1800 µS/cm equals 1.8 mS/cm. Most nutrient feeding schedules specify target EC in mS/cm, making this simple conversion essential for practical use.

Can I replace the electrode on the Milwaukee C65?

Yes, the C65 features a replaceable stainless steel electrode assembly. When the probe reaches end-of-life due to mineral buildup or corrosion, you replace only the electrode, preserving the meter body and electronics.