Stir, check, adjust. Keep nutrient strength in view.
The Milwaukee EC45 PRO turns a reservoir spot check into a simple routine. Immerse the sensor head, stir the nutrient solution and read the illuminated scale. EC, CF and two ppm scales share the same stick, so you can work in the units used by your feeding program without doing a manual conversion.
EC45 PRO nutrient stick with four printed measurement scales.Match the scale to your nutrient program
Use the 0.2 to 6.0 mS/cm EC range for conductivity checks, or read 2 to 60 CF. TDS is calculated from conductivity: the 500 scale covers 100 to 3000 ppm and the 700 scale covers 140 to 4200 ppm. Keep the same conversion scale when comparing readings with your target; the two ppm scales are not interchangeable.
The EC45 checks overall nutrient-solution conductivity. It does not measure pH, identify individual nutrients or control a dosing pump. Its role is a quick, repeatable strength check during hydroponic, horticultural and agricultural solution management.
Scale detail: match the EC, CF or ppm scale to your nutrient program.From first use to a stable reading
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Prepare the meter. Remove the protective battery film, then screw the battery cap back on tightly.
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Immerse and stir. Place the probe head in the nutrient solution. The meter starts automatically; blinking indicates a reading that is still stabilizing.
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Read the steady LED. Use the EC, CF or appropriate ppm scale. The 24 blue LEDs make the scale easy to locate. Automatic temperature compensation operates from 5 to 50 °C.
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Rinse and put away. The meter switches off 30 seconds after the reading stabilizes. A change in conductivity resets the timer. For another check, remove it from the solution and immerse it again.
Factory calibrated, not maintenance free
No user calibration is required. Keep the graphite electrodes clean so deposits do not compromise your checks. Rinse after each use and carry out the more thorough monthly cleaning described in the manual. The removable crown cap gives access to the sensor area. Store the meter clean and dry in its protective packaging.
Removable crown cap for access during electrode cleaning.What comes with the EC45
- EC45 PRO nutrient stick meter
- Three 1.5 V AA batteries
- Plastic tube packaging, instrument quality certificate and instruction manual
The floating casing is rated IP67. Battery life is approximately three years at ten measurements per day, and the LED scale provides a low-battery indication. Replace batteries before they are exhausted and keep the cap securely closed.
Powered by three AA alkaline batteries. Follow the manual when replacing them.Manuals & brochures
OFFICIAL PDF MANUALMilwaukee EC45 PRO instruction manualMeasurement scales, battery setup, cleaning and care. Open the complete manual →Build the right workflow
Related workflow: Milwaukee MW100 PRO pH Meter. Add a separate pH measurement alongside nutrient-strength checks.
Related workflow: Milwaukee MW802 PRO 3-in-1 pH, EC, TDS Combo Meter with ATC. Consider a portable pH, EC and TDS combo meter when those measurements belong in one instrument.
Questions before you choose
Does the EC45 measure pH?
No. It measures electrical conductivity and displays CF and conductivity-derived TDS. Use a separate pH meter for acidity or alkalinity checks.
Which ppm scale should I use?
Match your nutrient program: the 500 scale reads 100 to 3000 ppm; the 700 scale reads 140 to 4200 ppm. A reading on one scale should not be compared directly with a target on the other.
Do I need calibration solution?
The EC45 is factory calibrated and requires no user calibration. Cleaning the graphite electrodes remains part of regular care.
How do I know the reading is stable?
A blinking LED indicates an unstable reading. A steady LED indicates a stable reading; use the printed scale beside it.
What happens outside its measurement range?
The bottom LED blinks for an under-range reading and the top LED blinks for an over-range reading. The EC measurement range is 0.2 to 6.0 mS/cm.
Is it waterproof and temperature compensated?
The casing is IP67 rated and floats. Automatic temperature compensation covers 5 to 50 °C; the operating environment is 0 to 50 °C, with a maximum relative humidity of 95%.
Are batteries included?
Yes. Three 1.5 V AA batteries are supplied. Remove the protective battery film before first use. Typical battery life is about three years at ten measurements per day.
Should I store the sensor wet?
No. Rinse after use, follow the monthly electrode-cleaning procedure and store the EC45 dry and clean in its protective packaging.
